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.

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