The 30 days part is most likely a legal compliance bit to cover their asses if their backing data systems ever take a big dump.
They need to use an asynchronous system to be tracking when your chat becomes "finished" and then likely queue it up to a system looking to propagate deletes. They have to choose some kind of SLA on that and probably went with a common data privacy user data deletion window of 30 days.
They need to use an asynchronous system to be tracking when your chat becomes "finished" and then likely queue it up to a system looking to propagate deletes. They have to choose some kind of SLA on that and probably went with a common data privacy user data deletion window of 30 days.