I think it's a bad anti cheat considering all the bad things that could happen with it. The anti cheat is really invasive compared to other anti cheats and the fact that it runs even after the Valorant is off is a big red flag to me and there are reported incidents of the anti cheat affecting performance in completely different games as well.
RE: What Is Your Thinks About Vanguard Anti Cheat?
It's far too invasive for an anti-cheat. Instead of making a robust anti-cheat through legitimate means, they decided to create an obnoxious anti-cheat that enforces itself through obscurity. I don't think that any game should be allowed to have an anti-cheat that is always running on your PC, even when the game isn't, and actively interferes with other games and drivers.
RE: What Is Your Thinks About Vanguard Anti Cheat?