Just tried typing Jordan on mine, and my suggestions were "on", "is", and the Jordanian flag. So I'm pretty sure you had to have typed the words "Jordan Peterson" before for it to make that association.
The donation prompt can permanently disabled with two taps, so I'm not sure why that'd be a reason to abandon it. It's a complete non-issue.
"You've been using FUTO keyboard for X days. If you find this app useful, please consider paying to support future development.
FUTO is dedicated to making good software that doesn't abuse you. This app will never serve ads or collect your personal data."
I don't mean to be rude here, but this is an extremely bland, mild message. There's nothing passive aggressive about it in any way. What do you find aggressive about this?