I've heard of Revolut and Curve so far.
Just until they kill it as well
I generally feel fine if I can preview the payload and it doesn't contain too identifiable stuff. Even better if you can redact fields. NewPipe has a simple implementation of this where it just opens up your email client with a pre-filled body.
The same kinda people who name their browsers Firefox or Chromium. We just got used to those names.