Google was pretty friendly and cooperative and told me the favicons are indeed the problem, and it can/should be fixed by updating in the privacy policy to "
disclose how your app accesses, collects, uses, and shares user data":
So, I have updated the privacy policy and added this new table:
https://github.com/M66B/FairEmail/blob/master/PRIVACY.md#summary-of-shared-data
I am not sure if it covers everything, so feedback is more than welcome.
@mkasimd maybe you can take a look?
Note that I have also enabled BIMI, Gravatars, Libravatars and favicons for the Play store version again.
The short term goal is to release a Play store test version (and associated GitHub version) and to get the update approved. I will think about the next steps after this has been accomplished. Given the huge number of supportive messages I received (much appreciated!) the project will be continued in some form in any case.