That's why I think that Microsoft is walking a fine line here, blocking other people trackers while keeping their own may be considered anti-competitive. If Edge had the market share IE had in the past, that would be calling for legal trouble.

Google themselves also suffer a lot from bad actors. Many people start installing ad blockers after visiting abusive sites, and these ad blockers block the more tolerable Google ads as a collateral. For that reason, they want to introduce a built-in ad blocker in Chrome, and unsurprisingly, given their position, they are taking a lot of precautions.