LinkRot - sgml/signature GitHub Wiki

You can boost your brand authority and earn quality backlinks by leveraging link rot to your advantage. Comb through influential websites, online journals and even your competitors’ websites to look for broken links and 404-error pages. Then create a similarly-themed resource and turn it into an epic, stand-alone post. Use graphs, statistics, research and interviews with influencers to really fill out your content.

Persistent and Rot Resistance

Rank	Medium	Resistance	Deletion Policy (in lieu of payment)	Avg Grace Period / Retention Window
1	Email	Very High	Accounts may be deactivated for inactivity, but local archives persist indefinitely	6–12 months inactivity before deletion (local copies permanent)
2	Paid web hosting	High	Site taken offline once subscription lapses; files often deleted after grace period	~30–90 days after non‑payment
3	Paid web storage	High	Access blocked after subscription ends; files may be deleted after retention window	~30–180 days depending on provider
4	Free corporate web hosting	Medium	Service shutdowns or account inactivity can trigger deletion without notice	~30–90 days inactivity; immediate if service discontinued
5	Free corporate web storage	Medium‑Low	Accounts deleted for inactivity or service retirement; limited recovery options	~90–180 days inactivity (varies widely)
6	Free university web hosting	Low	Hosting removed after graduation or departure; content usually purged	Immediate to ~30 days post‑affiliation
7	Free university web storage	Very Low	Storage deleted immediately or shortly after affiliation ends	Immediate to ~30 days post‑affiliation
8	Free military web hosting	Low‑Medium	Hosting tied to service affiliation; removed after discharge or reassignment	Immediate to ~90 days post‑affiliation
9	Free military web storage	Low	Storage tied to active duty accounts; deleted after separation or inactivity	Immediate to ~30–60 days post‑affiliation
10	Free non‑profit web hosting	Medium	Hosting depends on funding or program continuity; may be removed if project ends	~30–180 days after program termination
11	Free non‑profit web storage	Medium‑Low	Storage tied to grants or initiatives; deleted when program funding lapses	~30–90 days after program termination
12	SMS	Very High	Messages stored on carrier servers temporarily, but persist locally on devices	Carrier retention ~3–7 days; local copies permanent unless deleted

Email Account Activity Metrics

Definitions of Activity with REST API Support

Service	Definition of Activity	REST API for Programmatic Login
Gmail	Activity = recent sign‑ins, IP addresses, access type (browser, POP/IMAP)	Yes (via Google OAuth 2.0 / Google Identity API)
Yahoo Mail	Activity = sign‑ins, external connections, account changes	Yes (via Yahoo OAuth 2.0 APIs)
Microsoft Hotmail / Outlook	Activity = sign‑in attempts, locations, devices, methods of access (Recent Activity page)	Yes (via Microsoft Graph API / OAuth 2.0)
AOL Mail	Activity = recent logins, connected apps, account changes	Limited (OAuth 2.0 for AOL via Verizon Media APIs; not widely exposed for mail login)
Vivaldi Webmail	Activity = logging in or participating in Vivaldi services; must be used every 6 months	No public REST API for login; IMAP/SMTP only
GMX Mail	Activity = logging in regularly; accounts deleted after 6 months inactivity	No public REST API for login; IMAP/SMTP only
LinkedIn InMail	Activity = sending/receiving premium direct messages; credits consumed/restored	Yes (LinkedIn REST API supports OAuth 2.0 authentication and messaging endpoints)

Code Hosting Persistence

Free Hosting Services (Non‑Credit Card Based) with Rate Limits, URLs, Founders, Latest Changelog, and Backers (≤3 Backers)

Language	Service	Requires Credit Card	Rate Limits (Free Tier)	URL	Founder(s)	Date of Latest Changelog	Backers
Node.js	Glitch	No	Projects sleep after inactivity; limited RAM/CPU	https://glitch.com	Anil Dash	June 22, 2023	Supported by Fastly; acquired by Tiny (2022)
PHP	000webhost	No	1 website, 300MB disk, 3GB bandwidth/month	https://www.000webhost.com	Hostinger team (Arnas Stuopelis)	July 8, 2024	Backed by Hostinger
PHP	InfinityFree	No	Unlimited disk/bandwidth (fair use); CPU/inode limits apply	https://www.infinityfree.net	Hans A. (Netherlands)	Nov 19, 2025	Independent, community‑backed
PHP/Perl	AwardSpace	No	1GB disk, 5GB traffic/month	https://www.awardspace.com	Zetta Hosting Solutions & AttractSoft GmbH	Active since 2003 (no recent public changelog)	Privately backed by AttractSoft GmbH
Perl	HelioHost	No	Community queue; limited slots; shared CPU/memory	https://www.heliohost.org	Ashoat Tevosyan	2025 (GitHub wiki updates)	501(c)(3) non‑profit; community donations
Perl	Angelfire	No	Free tier with ads; limited storage (~20MB) and bandwidth; CGI scripting in Perl supported	https://www.angelfire.lycos.com	Founded by Xoom, later acquired by Lycos	Legacy service, still maintained	Backed by Lycos