Firefox came into the mainstream because of power-user recommendations and the browser ballots.
It should be illegal for a significan platform (say 10mln users) to make its own browser, or any really, the unquestioned default. Users should be prompted on first use, giving a randomly ordered selection of any capable browser. If users can just click through it the choice should be random.
This is the only way to maintain healthy competition and ensure independent yet functional standards. Otherwise incentives will continue to centralize power.
But it was a completely different situation.
- There was a huge influx of new internet users who were all asking their techy friends which browser to use. This is not the case now. People mostly stick with what they know.
- FF was the better product for pretty much all use cases. If this proposal does go through, this will not be the case. It's nice that FF can block ads, but it's ultimately useless if the average user won't be able to access Netflix/Youtube/Facebook/their bank account. It will be an objectively worse browser.
And as I said, the sustainable solution is browser ballots back by the force of law. It's worked where it's been tried.
Anti-trust based solely on narrow definitions of consumer harm on the other hand, serve only the capital owners. And they'll leverage and co-opt any and every popular and useful innovation: open source, community contributions, open standards, patterns light or dark, etc.
Otherwise Palemoon is as doomed to obscurity as Firefox, if not moreso.