Why do you think a bot is not monetizable? What if some payed by Putin pro-Russian trashtalker (bot by definition) without Adblock installed (unlike most of decent users who are not happy to see some ads in the social network they love) - who is monetizable and who is not in this case?
Because they devalue your ad business. Your views don't lead to enough click-throughs which don't lead to conversions for the buyer. Even if you imagine that the paid sockpuppet operator might be interested in the ads, their whole business is representing themselves as being from a country they're not so the targeting is all wrong.
