The idea is that the unauthenticated public TL (if enabled) should provide a peek in what's happening, but shouldn't let you go back forever.
This change makes it so that you can see the 20~40 newest toots no matter what, but can then only go up to 2h back in time.
Of course this doesn't prevent people from crawling more often than that…
@Thib yes, but it would be very noticeable, when done badly at least, so it could be easy to block
@hirojin I think crawling back pages and pages would be more noticeable, and that happened, and barely anyone actually noticed
This is a small personal instance running on a couple small ARM servers at home.