You don't unless you have a practical reason to.
Now some aspects of how businesses conduct business is somewhat of a "practical reason."
For example, even if Apple products actually provided decent cost/performance ratio, I would never switch over to them because of how hostile they are to leaving their ecosystem. I don't have a huge problem, as a user, with more nebulous complaints about hostile business practices and the like. The issue is simply that it would be a pain in the ass for me personally, and require making a lot of annoying compromises, or swapping to more, and less effective apple hardware.
Like if we roll back the clock to 2015 when MBP's are probably hands down the best business laptops, from a hardware standpoint I'd love one compared to alternative laptops, and at least for a work-only computer when I have zero other devices and interactions to worry about, it could be a decent option.
Don't like some of the ways they do business? Who cares, I'm not going to shoot myself in the foot on general principle.
The difference with google services is a lot more stark though, there's nothing I would even remotely consider competition to gmail now, and the things were only worse when gmail first came out. These days migrating would be an absolute nightmare. I'd still do it if someone offered me a way better option, but people in this thread are talking about downgrading to some shite service on general principle, causing themselves significant pain in the ass in order to give some other company that definitely does not give a shit about acting in some morally upstanding way money, for a lower quality product.
There's no replacement for youtube, and frankly video services are are starting to look like a natural monopoly to dwarf all prior uses of the term, as youtube could never survive outside of google's business model, and can't be split up without just destroying it completely.
So anyway, I don't think people are being all that honest about their "switch from google" being ever so easy and worthwhile. Personally I lose a lot by swapping purely because the alternatives are shit, so I won't be doing it.
People switching from android to iPhone because "goOgLe bAd" are the height of irony though.