~snip~
You are also correct, but if we look at most of the projects out there and their pattern, you will notice that what they usually talk about is making something better. Where they think a particular network is not doing fine, they offer a better service, like in terms of fees, fastness, and many others. This is one of the reasons why we have so many smart chains and layer 2 projects because they want to make things better.
It seems that the main purpose of creating second-level networks is to make money, since they could all use ETH to pay for transactions, but their funds launch their own tokens. In my opinion, it would be better to change the Ethereum network than to create so many L-2 solutions working on top of this network. I believe that over time, many people will come to understand that when the network performs all operations at the first level, it is much more convenient.
People like to compare everything, so even if networks do not seek to compete, their users somehow point out the advantages of some over others.