None of that is what defines a monopoly.

There's only one store that matters. They have unthreatened supermajority marketshare. Customers go there by default - sometimes exclusively. Developers can sell there, or they're basically fucked.

What you're concerned about are anti-competitive practices. But some businesses don't need those, to lack any relevant competition. It can just happen. They didn't do anything wrong. They're still monopolies.