Brave added affiliate links to URLs. While I agree this is quite shady, it is not much different from how Vivaldi makes money. Also Vivaldi is not open source and doesnt come close to Brave or Librewolf in privacy tests. Vivaldi's fingerprinting protections are incomplete (it seems they stopped at canvas randomization?), it features a weak built-in content blocker, and has an insecure default config (JS JIT and WASM are enabled). I would compare it to default ungoogled chromium + basic adblocker. Vivaldi is no where close to Librewolf or Brave in terms of adblocking, anti-fingerprinting, and browser security hardening. Vivaldi is a neat browser, but a privacy one? I don't think so.

EDIT: Here are some links. Privacytests.org is a precomputed comparison table, the other two sites are fingerprinting sites which give a better idea of how much must be protected for adequate anti-fingerprinting.

Independent browser Privacy tests: https://privacytests.org/
CreepJS fingerprinting site: https://abrahamjuliot.github.io/creepjs/
Firefox Arkenfox fingerprinting test site: https://arkenfox.github.io/TZP/tzp.html