You can have third-party Android app stores. Can you say the same about Apple? While I agree that Google has market-dominance, they are not anti-competition or anti-consumer in the same sense as Apple. Android is open source, Chrome OS is open source, etc. Google is actually providing and contributing something back to the community. Apple intentionally locks people to specific hardware and to their app store.
Came across it while following the development and distribution of iSH (https://ish.app/), which has now made it into the main app store.
Prior to publishing to AltStore, iSH was only available on Test Flight, which has a limitation on the number of users who can join (10,000). So they'd periodically have to kick inactive users off the TestFlight so others could try it.