Yep.

And the FLOSS/Linux phone hardware attempts have frankly sucked.

I was hoping that my PinePhone Pro would actually be usable. But no, its a PineDoorstop.

Proper Linux would be a great 3rd choice. But yeah. We've got a duopoly and not much we can do about it.

GrapheneOS is a proper Linux. The hardware isn't open, but otherwise it's quite nice and clearly designed for the end-user's benefit, in stark contrast to the more widely-adopted alternative mobile OSes.