Honestly, right now I think they are just riding the wave and trying to make quick banks.
I dont really see any FAN Token really valueing the tech and doing it for the sake of it. Just like us, most of them are doing it for the hype and the money.
That being said, if somebody does it but not really giving their hearts into it, it will be a trash product.
People investing in these coins because supply is very low and Its Up and down are happen with small flow of money. This is the reason when btc down, some whale buy these fan coin and these fan coins pumped and we saw in gainer list. If we talk about their usecase so i didn't found any real usecase but i am surprised why Binance a big exchange promoting these coins because every month There are some contest for these fans token and holder get some free airdrop of token or Nft from Binance. These Fan tokens will not remain for long time because hype will not remain for time and many exchange have strict rules for marketcap. If people stop investing in these coins for sometime, exchange will delist these coins.