I have cut basically every major American retailer out of my life. The only one left is Gmail, and that has to stay for now until I sell this house as the utilities are on it, and it's frankly too much trouble to change it before we GTFO OF HERE.
I don't use it for anything else. I still have protonmail only because the friggin internet archive won't recognize tutamail.
My laptop is on Libre office. Vivaldi browser. Of course I rarely crack the thing anymore.
I killed Amazon last year. I have had some trouble with ebay sellers, but no more than expected, really. I get everything else I need from people with an e-commerce website.
Fancy that.