for no 3 there is a setting you can change in Mastodon to enable longer posts but it's a code change not a configuration one.
However they maybe using something other than Mastodon which allows for longer posts
Peter Mount
npub1hh…fwhy6
2024-11-10 14:24:46 UTC
in reply to nevent1q…q7qm
Author Public Key
npub1hhn2u26m72u232jj3rzcu5vdnqdhk0xp8prwmut3596au93mc5zsgfwhy6Seen on
wss://relay.momostr.pinkPublished at
2024-11-10 14:24:46 UTCEvent JSON
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