Huh? "One App Store" is bad, it forces you into a vendor lock-in, to have no choice but to accept whatever a store wants you to do. I'd rather have the freedom of choice rather than being limited to a monopoly.
Patreon was told to change its whole billing model until a court found in their favor: https://siderea.dreamwidth.org/1878206.html That's the kind of thing I think we'd both find unacceptable.
But I'd still be ok with "one store, resonable rules, respect user privacy".
Meanwhile on google's lawn, there's hundreds of things like this: https://play.google.com/store/apps/details?id=com.falnesc.to... a torch app that contains ads and shares your location with selected third parties. At least they don't require permission to read your contacts. (You can buy an ad-free "secure" version for $0.99, or you can just ... turn on your phone's LED for free because that's provided by the OS.)
Technically firefox extensions are "one app store" too - you can't sideload unless you install from the dev/nightly channel and fiddle with the settings. But at least it's a not-for-profit store. Chrome and even Edge allow you to sideload.