First of all, UChat has an "auto clean up bot user" feature which can help you control the bot user amount and prevent exceeding the "bot user limit" on your workspace.
Please check this tutorial about how to use the "auto clean up bot user" feature:
https://youtu.be/hzAR85GHu1M
In the case you didn't set up any auto clean up:
if your workspace is an LTD workspace:
your bot users will be automatically cleaned up based on their last interaction time, the oldest first.
if your workspace has a monthly or yearly subscription:
your workspace bot user limit will be increased automatically and therefore, your subscription fee increased.
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