We can imagine all we want, but that's up to the markets to decide, not you, advertisers, or anyone else. Advertisers just want to have an audience they can make money off of. If reddit scares away what it's trying to sell to advertisers because it's ideals aren't aligned with its product/userbase, then it deserves to be disrupted by competition.

It's not like we live in a dictatorship where we can easily designate what is/isn't appropriate for a site like reddit to be successful. If a competitor to reddit finds itself being more successful by hosting things like TheRedPill and CoonTown, then so be it, that's how the market works.