If you try to squash conspiracy theories like this there will be those free-speech hardliners who see it as crossing a line.
If you allow the crazy conspiracy stuff then there will be people who complain about the platform being a toxic influence and promoting hate speech etc.
Personally I don't see anything wrong with attaching additional information like this as opposed to outright censorship or something. But my guess is that plenty of other people will complain.
Side note: I can't help but notice how polarizing issues involving free speech have become in recent years. Any topics involving perceived censorship by any host simply ignite.