I've only seen one bot since the symbol art block but it seems like they're able to repeat-send the same message again without the old bypass of appending a bunch of random characters at the end. I'm guessing they only switched to symbol art because it bypassed certain filters and maybe provided a larger bubble?
I wonder how much a non-bot reasonably types in Central City. I've had plenty of extended conversations in the middle of town but when there's several people involved it's still maybe one or two messages per minute each person sends rather than every ten seconds. And of course it's all only in one block.
Feels like the game could definitely enact a few measures about that, without outright blocking chat features for newer players.
Like, if switching blocks temporarily disables chat for 1-2 minutes it'd stop bots block-hopping, forcing them to either stick around (and get reported rather than hopping too quickly for other players to click them) or wait 2 minutes after every hop (reducing spam).
Or maybe if players had a hidden limited allocation of say 60 chat points where sending a message consumed 1 point and switching blocks (besides UQ matchmaking) or logging out consumed 30 (or less if they had less), but 1 point was restored every 60 seconds and trying to send a message with 0 points gave a preventative message. That wouldn't impede any realistic regular chat but would force bots to switch accounts every 2 blocks if they wanted to keep being persistent with spam and shift the balance of bot account creation and usefulness a little further away from them.