This could safely be said about 98% of altcoins. They are mostly garbage, and I can't imagine who uses these things.
there's a big difference between alts and one coin. the way most alts themselves operate are transparent and functional. you can mine or stake them, there's a block explorer and they're on exchanges. sure, there's a scammy layer on top, but one coin is a scam from the ground up.
Onecoin is long time scam its ponzi and operated by those fucking fraudster who use the fame altcoin and name it sonthey can use it to their scheme and to attract newbies by their to good to be true profits, so for this though i don't think one coin is can be called a altcoin since onecoin don't listed on any exchange and it is very bad system and only attracting those people who didn't know so much about altcoins.