Not sure how honest & reliable this is. It’s bad enough that they decided for this.

In the privacy policy they state how and why they collect data. They also say how to potentially stop giving them this data

https://www.mozilla.org/en-US/privacy/firefox/#to-adapt-firefox-to-your-needs

I agree this is an issue. They move away from a privacy oriented community. Additionally, the reason they give is vague and easily dismantled. What I’m interested in is why this would be a good enough reason to switch providers. They haven’t changed anything crucial in their mail offering, so why should I switch?

Thanks, I’ll check it out

Would not updating Revolut keep the app compatible as long as you don’t sign out?

If so, don’t update the app and write down the build number of the last app version which worked on GrapheneOS. That way you would have a bit more time to sort things out.