I’'d argue changing who can see your data from either a large group to a smaller one or one you do trust vs one you do not trust precisely is protecting your privacy.
It's always astounding to me that people put more trust in an intangible rando from the internet than into organizations governed by law. Like those people who don't accept mainstream medicine but eat random supplements they imported from India by the kilogram.
Also FWIW you can host your VPN, you do not have to rely on a commercial VPN provider.
Sure you can. And where does that traffic go?
If you e.g. host a VPN in your home network and you connect to it from your phone, and then you use this connection to access the internet, then your traffic will just be visible to your home network's ISP instead of your phone's ISP.