And this is why "mandatory app to configure" is an instant dealbreaker for me for any piece of hardware. Don't buy crap like this. Force companies to be better.
I fear that this will eventually happen to all Amazon Eero products, which has partnerships with telcos in my country for "free" routers.
If it's a "router" and you can't install a OpenWRT on it, then it's an absolute no-brainer to not to buy it.