It works with most websites, it syncs my bookmarks across computers, lets me reuse my existing Google account instead of needing to make a new one, and I really don’t care about my data going to Google because I already give up my data in exchange for free services (which feels like a win-win).
Monopolies sure seem great in the short term. Is older folks have seen the full lifecycle and know what they turn into. See Comcast and AT&T. Duopolies are not any better, most of our food comes from 2ish companies. Early on they promise you everything, then they squeeze you for less and less.