You can go outside if you choose too. Use another platform.
The only other credible platform is Android.
Google have just announced draconian sideloading restrictions.
Google is fundamentally changing how sideloading works on Android, especially for apps from unverified developers. Here's are the new rules.
www.androidauthority.com
You can still do it but you have to enable developer mode (last I looked that was a 'hidden' feature that required something like rapidly clicking 10 times on the systems settings icon) then answer questions to verify you're not being co-erced, re-boot,
then wait 24 hours (!) then re-authenticate...
Hopefully that (esp. the 24 hour cool-off period) would be enough to protect people like
@surferfb's mother-in-law from scammers, without
totally preventing power users from sideloading - but it pretty much rules out any hope of a sideloaded app or third-party app store being able to compete with the Play store for regular customers.
We'll have to see whether that raises any accusations of anti-competitive behaviour (Google being subject to the same rules as Apple there) - if not there's nothing to stop Apple allowing sideloading with a similar level of... dissuasion.
Show me Europe's equivalent of Apple or Google, just for starters.
...not really the point - the "steering" argument is not about European phone/OS companies trying to compete with iPhone or Android, it's about all the other businesses who sell different products and services, and basically have no realistic choice to support both the Apple App store and the Android Play Store.
There's no "free market" if 98% of retail real-estate in the world is owned by one of two huge corporations who impose their rules on every shop.
...also worth noting that - even in the Land of The Free, Apple, Google, Meta etc. have been facing a series of expensive lawsuits over competition issues and access to their platforms, because that's the way the US regulates trade.