they're not stocks because stocks gives you equity in a company. there's no bitcoin, inc or ethereum, inc.

To be technical, some tokens are offering "dividends" these days, ex. sharing trading profits of a blockchain decentralized exchange. But I guess these tokens don't strictly represent a cryptocurrency, maybe a single cryptoasset more so. But those tokens could be traded like a currency...so it gets kind of confusing.

They also don't pay dividends.