in the ethereum network there are scams, but not as many as in other networks such as solana, BSC and TON. In the past binance smart chain was the network with the most scams because it was easy and hype. currently I see solana and TON have a lot of scams so we have to be careful with all of that.
Yes, wherever there will always be fraud, no exception, ETH is a fairly expensive network for a memecoin, but many successful memecoins start with ETH and then exist on several other networks.
I used to use BSC as well and that was really the beginning of my playing memecoin which ended up just being a junk memecoin because there were too many scams and presales that kept going on.
Unlike now on the SOLANA network which is even worse with thousands of memecoins being created every day, this is the peak of the biggest memecoin scam in my opinion.