Been there, done that, found more holes in vivaldi than the chrome itself, switched up to LibreWolf (a hardened fork of firefox.)

Vivaldi still uses Chromium as a base, so you’re still supporting Google and Chrome. Literally only Firefox and its forks use a different rendering engine (used to be Gecko, I think it’s Quantum now). If you are using a browser with Blink as a rendering engine, you’re using Google code, and Google will still be in control of your browser.