I think the more interesting question would be, how much data do they retain on you if you close your account?
Data retention
We keep your information only as long as we need it for legitimate business purposes and as permitted by applicable legal requirements. If you close your account, we will retain certain data for analytical purposes and recordkeeping integrity, as well as to prevent fraud, enforce our Terms of Use, take actions we deem necessary to protect the integrity of our Service or our users, or take other actions otherwise permitted by law.
My own biggest issue with data retention is not that these companies collect all this data (they need to for their business models to work) but that they keep all of it, forever, regardless of whether it could possibly still be relevant to any business purpose (such as chat conversions from a decade ago).
Can't they just keep (at most) the metadata?