Other than being an illegal security, it has no basis for suing anyone. You can trash talk AMP all day long if you want to. If you think someone is intentionally trolling then you should take that up with the moderators.
Are you a lawyer, can you say that for sure? Because the laws around cryptos are very vague.
You don't need to be lawyer. You can: 1) Consult your own lawyer. 2) Read the laws, do research and make a reasonable conclusion. If you can't sue people for "FUD-ing" Bitcoin, then you can't sue them for "FUD-ing" AMP.
It's funny how everyone thinks about any coins that it's somehow an "illegal security", like a guy I have talked with said the same thing about Steem. Others are claiming that about Dash too... It's really funny.
No. I don't recall whether Steem was an ICO or not, but DASH was not (although this coin is arguably a scam by Evan, but that's a different debate). If you're running an ICO on mETH for a token, and you've not registered this sale, then it's an illegal security.
In my opinion it's not a security, it's a crypto token that powers an app, the same way that Bitcoin or any other coin would any other app.
The law does not care about your opinion though.