Remember when Apple killed Flash? I heard it was because they wanted people to use their app store more instead of us playing games in the browser, so they could make more money. And Microsoft installing IE and setting it as the default browser? And now, Google is making changes to how we browse the web and adding things like Manifest v3, to boost their ad business.
The most irritating part is it is always gets packaged as being for our safety. The sad thing is I've often seen people even drink this user safety kool-aid, especially with Apple (like restricting browser choices on mobile - not sure if it's changed now).
I really think there should be some laws in place to prevent this kind of behavior. It's not fair to us, the users and we can't just rely on the EU to do it all the time.