Even if they implemented it correctly you wouldn't really trust a 3rd party to show your ads and risk strikes on your account.
you have to make sure you only show certain companies ads next to certain content, or they will pull out.
therefore you need to control the client. only show tier 2 ads next to nsfw content, etc.
they also aren't going to show certain promoted tweets on certain hashtags, topics, etc.
Doesn’t HN have a policy against this sort of thing?