That sounds like a good way to have your reports ignored by the system.
Doing so also blocks the brands from showing up as ads, in addition to blocking them from organically appearing in your timeline. It's a strategy that works well, imo.
I do this for ads that are irrelevant to my interests (and most ads they show me are). Saves my time in the future as a lot of Twitter ads are repeats, and sends them a message that their guesses at what's relevant to me are off.