Imagine having a money printer that prints an unlimited amount of dollars anytime you want. You don't have to do shit to earn it. Just enter the amount you want and press the print button. Voila! You are instantly rich. That's basically how garbage like dogecoin, ethereum, solana, XRP, fartcoin, pepecoin, clowncoin, etc. all work. They are just a digital recreation of the unlimited fiat money system but worse, with no discernible value beyond being a high-tech Ponzi scheme.
What are other differences?

A bitcoin mining facility
Just checked your signature lol
I completely (or at least partially agree), can only add that you can sybil shitcoin networks to get a shitcoin airdrop, and then swap the shitcoin for BTC on a CEX.
It shows that they're not completely useless if gotten through those means, since they can be converted to Bitcoin which is a better Cryptocurrency when it comes to investment purpose, the mistake people make is trying to see them as a store of value and hold for a longer period to get profits, they'll definitely point the middle finger at you anddump before you'll know it.
Instead of using my hard earned money to risk on this coins and regret later, I'll rather get them through airdrops and swap or convert to Bitcoin, it's another cool way of adding to ones portfolio; i mean for those holding Bitcoin, their are some risks that are meant to be avoided and some that are worth it, buying Bitcoin is that risk that's worth every penny.