I am not the author.
I found this blog to have both a short summary of the reasons as well as a pretty complete overview of the options for protecting against this specific threat model. I can just send this to people and they’ll understand the why and the how.
I am in the middle of getting rib of all the big tech in my life also. No more google. Though I do have a google phone, I’m running graphene OS with no google apps on it. And I use the full proton suit of things. Including their VPN on all my devices