Thank you for all that info and for taking the time to write it. Don't know why people can't be bother to just follow the link and instead expect you to repeat it all here.
>>greggm+(OP)
Perhaps it's due to conditioning on stack overflow, where posting links on their own always swiftly invokes rebukes from the moderators (because linkrot).
>>abraae+Oj
But these are permalinks? This is like linking to a github. It doesn't just "disappear." Unless Reddit goes under, which is just as likely as StackOverflow or HN going under.
At this point, with their market cap and increased moderation, probably less likely than the two I listed.