The price to pay for convenience is too steep for most people to migrate. Also if you just an average user, most of the time you will not get instant gratification for being more privacy-aware. The more you try to be more aware the more you realize that to achieve a certain level of privacy is really a pain in the ass.
Totally this for me and I'm someone who understands how bad Google is. I've been using the same Gmail account for twenty years. It's such an integral part of my everyday life. I have hundreds of stars on maps, a meticulously organised and synced Drive, all my YouTube favourites and subscriptions, Photos that are all mostly geotagged, etc. Degoogling would just be such a major hassle, and all my stuff would never be as nicely integrated ever again.
The price to pay for myself to move is way too high, I use 3 chrome profiles daily. 1 as my personal gmail and 2 work email profiles and trying to manage that in Firefox is just not worth it.
A lot of businesses use the google services and when you’re locked into using them through work there’s absolutely no reason to not just do everything in chrome with profiles.
There’s also the fact that Firefox sync is absolutely shit compared to the google sync features and while I understand why from a user perspective it’s a massive loss of functionality.