[Cthulhu_]

This is the danger of hosting your own comment sections; by the powers that be (be it companies like Google or coporations) you are the end-responsible for user generated content. There's some leniency of course, since you didn't write it yourself.

Personal anecdotes. Members posted porn gifs on my old fashioned forums 20 odd years ago, Google did not appreciate that.

Members posted stills from an unreleased game on my current forums; we got DMCA takedown notices from at least three separate legal people associated with the company that published said game. If we didn't do the takedowns ourselves, they probably would've gone to the host and have our site shut down.

TL;DR, if you use a 3rd party (host, service), your content has to comply to their terms and services.

[pixl97]

Are we also not sure that this is a danger of letting one advertizer become dominant on the entire internet and controlling a large part of human discussion?