I don't mind having ads, it provides income for boost from users who don't pay for it. This is okay, I'm not arguing against it.

However, trash tier ads pushing medical scams served up my meta of all places are another thing entirely.

That's not okay.

And no, "then just pay to use boost" isn't a valid response for a few reasons :

1. Not everyone will, and those that don't shouldn't be subject to manipulation and scams that could cause real world harm if they don't know any better. That looks bad for boost.
2. I run services myself and I don't hold my users hostage and use that as an excuse to get them to pay me money. A good user experience should convert users, not a bad one. I'd be surprised if you or boost do as well.

This is feedback for boost, not an invitation for flaming...