3rd party keyboards are a security risk. -You want your bank to reject them. They're just doing general protection from keyloggers, accessibility-based malware, and IME-based credential harvesting. Also, if you get that crap from FDROID, it's not being curated or keeping you informed of possible updates, abandonware, takeovers, etc.

Dangers of Using F‑Droid

GNUt reply:

If you have a bank account, you are not a child, it's your problem as an adult if your software choices get you hacked. If anything, the laws should be tweaked to accomodate such an instance as not to put the blame on the bank, but it shouldn't be babysitting what the fuck I do with my own phone.

"I know better than banks", and where have we seen people constantly take blame for their OS instead of admitting the OS is the problem, or claim to know better than professionals? Hmmmnnn...