Telepath is premised on post ephemerality and AFAICT also does not allow text cut and paste.
No stopping screen shots etc but ftr.
* that there is no stopping screen shots etc. is arguably the real topic; until such time as there is true revolt, surveillance capital renders inert any idea of personal invisibility, opting out, or avoidance of future accountability for contemporary actions, as you suggest.
As well known in this forum, there is no escape, not using incognito mode, not using TOR, not opting out of the sociopathic Facebook ecosystem which happily profiles you based on tagging and public data... we live in the panopticon.
Those of us who are not stainless steel rats should moderate our expectations accordingly. :|
Does such a thing exist?
I'm sitting here fighting urges to build a prototype.
There are people on mastodon/pleroma who have scripts that automatically do that for posts older than 30 days, etc.
Snapchat and instagram stories are ephemeral, but those are different from traditional social media with posts.