I'm not really answering your question here, but sideloading allow alternatives with different goals than google play.
For example F-Droid is actually very big particularly with users trying to get rid of google services on their phones.
But it's a marketplace for opensource apps and services, which most commercial apps are not.
For example F-Droid is actually very big particularly with users trying to get rid of google services on their phones. But it's a marketplace for opensource apps and services, which most commercial apps are not.