Privacy/no data mining is (frankly) a huge deal and a major problem in modern society is that this is not valued at all. To me, this is really analogous to the climate crisis in the sense that we've known about the impending climate crisis for decades and no one valued it till we got to the point of no return/crisis point. I really cannot emphasise enough what a big deal it is to value your data/information/privacy.

Other than that, Linux really is a functional OS and there will be other benefits like multiple desktop styles to choose from, the possibility to do more advanced things if you need to (if learn how), the OS is virus-free, better performance (because the computer doesn't need to work so hard on your OS and can spend that energy on other things), giving life to old hardware that Windows no longer supports (and saving your money as well as the planet from thr e-waste), the importance of an alternative choice so the market is not monopolised by predator corporate giants. There will be loads more benefits, but those are a few to begin with.

It also has downsides (as mentioned above).