My dumb theory is that they’re trying to break up the “monopoly” allegations. But, I’m not sure what the stats are for how many people use ad block blockers like ublock, and are willing to migrate to a different browser because of its loss. On top of that, like others say there are still ad blockers available.

Terrible sample size: I moved to FF as soon as I couldn’t use a cookie cleaner for web dev work, and ublock origin.