Apparently (I haven't personally validated) the app complains that it doesn't have google services, but works nonetheless
I haven't given up any info to it: I joined nothing. Already a couple of codes it didn't recognize and wanted me to add to their database, but... you et alia already made it sound dodgy so... I will likely delete it, but it proves the case that there is definitely a need for something libre and open.
A Mastodon server friendly towards anti-fascists, members of the LGBTQ+ community, hackers, and the like.