I don't agree. If I search for "leatherman" it seems totally reasonable to give competitors a chance. I generally think brand recognition is too powerful. If there is another high quality multitool on the market for a better price, why shouldn't I know about it?

Disclaimer: See my sibling comments for some my general thoughts on the problems with banning trademark ads.

But for your specific example - I get where you're coming from, but I'm skeptical that the ad market is even that functional.

Firstly, if I google "leatherman", every sponsored result for Leatherman brand multitools anyway. (And no amount of refreshes or re-searches gives me anything other than Leathermans.)

Secondarily, I'm not convinced that the set of advertisers (not counting Leatherman itself) that will advertise for "leatherman" are actually on average a better products for the consumer. (e.g. as opposed to lower-quality, higher-priced knockoffs.)