people attempt to mitigate it by only store/relay certain data.
That would work too: let the bounty spammers keep their own database.
But i expect older post on bounty section cannot be obtained easily. It could be because node which store it currently offline or the software unable to found out which node has the data.
Now that I think about it: if different users all see different posts in a thread because they have different moderation-
settings, the thread can become messy. I'm also unsure how new users would have to decide who's moderation to follow.
Someone should build it to answer all those questions

If all software by default use same moderation configuration, i expect it'll be less messy.