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.
I said Vivaldi is not open source a 2 comments ago. I said I recommend Firefox and derivatives, including Librewolf, I said Brave may be more secure, but shouldn't be used for reason that have nothing to do with it. Since you are not reading my comments anyway, I won't spend the time.
Your comment I was replying to said "I don't know where you are reading that Vivaldi is closed source. The source code is right here: https://vivaldi.com/source/". I was responding to that with Vivaldi's statement about how the browser is not open source.
Source available is closed source by the OSI definition, which is what is widely used and understood. The "closed" in closed source doesnt only refer to source visibility but also the freedoms upheld by open source.
Since it is source available, it isnt open source and therefore closed source.
Edit: we obviously have different definitions. I did not mean to argue over semantics. I would personally never trust a browser with proprietary code, even it is source available.