Actually there are more successful ICOs and Crypto projects that even isn't backed by companies.
Just like Oyster Pearl PRL, one of the most undervalued and underrated cryptocurrency in the market today, at the start it's ICO cap only gathered $75,000 but still the lead developer (Bruno Block) managed to push it into success.
I mean, it doesn't mean that if they aren't backed by companies they are scams, some of them have the potential to be the next top altcoins as well because their Crypto project will decide the price value in the crypto market.