Mastodon.social has the default 500 character limit. There are a few which have changed that (because it's not a configurable setting). Most large servers on this list aren't blocking too many others and aren't blocked by others https://fedidb.org/software/mastodon
(Maybe don't choose mstdn.jp)
I host https://mastodon.world myself but there are many others like it. For me, choices could be based on:
What's the server topic (if any)
Is the server run by a single person, or a team? (For continuity reasons, but this info is mostly hard to find)
Can I agree with the server rules?
Also, you could consider other platforms which are similar to Mastodon, and can communicate with Mastodon, but might have some features you prefer which Mastodon hasn't't (like quote posts, bigger character limit etc). For my personal account, I use Sharkey (https://sharkey.world is mine too), but you can also consider Pleroma, Friendica and many many others.
Sorry if I made the choice more complicated... and let me know if you have questions.
Actually 2 reasons why. First and most important, this was needed so we can use tooling to detect and remove CSAM material.
Secondly, it's because this is more cheap and scalable than having it on disk.
I fixed that link, but actually lemmy.world/legal should redirect to legal.lemmy.world, which it apparently doesn't always do.
So we'll look into that as well.
Our Monero address is
83tnuFN4f28jRxTBW9qGDad2U23qNE5nfeW4Pfyd85oWMW7J9gqpXi3S8FDbX5uEeCAKcGnSpS2XT5dGwYiELthg8XuDrxH