The websites don't seem to want to support Firefox, so Google definitely isn't blameless, but we should probably at least blame them correctly.
I use FF on Android too. Android is better than others. I have Chrome disabled on my phone and there are some things that just won't open without it. It won't let me shut off the "Play Protect" nag every single time I install or update something from F-Droid. I've accidentally turned it on countless times. But it is the least worst of the mainstream mobile OSes.