I'm pretty sure there is no way for them to supply an ios version without having to go through some sort of apple approval process. hardly boycotting to say that you're not about to put up with that crap.
Don't they have to go through a Google approval process for (official) Android? I'm not sure I see this as a big win unless they are strictly supporting GrapheneOS and other de-Googled Androids.
they do, but it's on fdroid too - at that point the play store is simply a nice to have. if google does anything they don't like they can just say okay and keep publishing on fdroid, they have not lost whatever efforts they have invested into android. apple has absolutely no way to just publish an app and let people install it, which at least to my mind delegitimises them as a viable platform. I'm pretty sure if I made open source mobile apps they would be android only, people would be free to take the source and release an ios version under different branding.
It's notoriously not on f-droid. The way FUTO licenses and/or builds its thing is made deliberately incompatible with f-droid's main repository.
You can add the futo repository to the f-droid client, but when people talk about f-droid they really mean the main repository, not the extra hoops to add less trusted third parties.