The real problem with Ethereum is the centralization of the network at some point, as long as there is centralization then the government can make changes such as banning people from using it and so on.
But personally, I don't really care about classifing.
And most likely only biggest most regulated exchanges could even list it. Reducing the number significally.
Developers would think twice using it as a platform, and if eth is security, how layer 2 tokens wouldn't be as they are part of the same system? And it would be just a matter of time until this would affect on every coin and token out there. And that's probably only a surface as i am not an expert.