You can not call Shiba Inu tokens a scam,
but overall they serve no real purpose in the cryptocurrency world. They are meme coins (Shitokens).These tokens are 100% premined and are made just to make the developers billionaires. These tokens are Pump and Dump. People buy them dreaming to make huge money in a very short time but in the end, only those lucky to board early (developers) will be on the receiving end.
You'll be the one paying them. They hold no real value so they will go dead sooner or later.
Know the basic difference between a token and a coin first. All of the tokens are on ETH and Binance smart chains. People don't know how easy it is to create these tokens and fall for the traps. They pay huge sums for advertising and creating fake hype.