I mean lower altcoin just means fewer people are buying the token, and vice versa. Bitcoin on the other hand has many buyers compare to all of the altcoins, so it's pretty obvious that it has a larger market cap.
Even those top altcoins have the same use case like in the case of Ethereum, Cosmos, Cardano, Polygon, Binance where they have a smart contract feature where developers can create their own application thru the blockchain of these projects. On the other hand, there are some altcoins out there that has no use case at all, or if there is, it wasn't beneficial to the investors, and to the people. It's just there for no reason at all, or they will just scam people.
This is the problem, and I don't see any solution to it aside from not investing into new projects. This is also the reason why I'm focusing more on the top altcoins currently. I don't want to put my money into new projects, projects that I know is a scam etc.
A good practice I will recommend for all expecially beginners is that they should invest mostly in Bitcoin as this is highly save for the future.
Take note that Ethereum first launched here as well, and it became popular though I know that this forum isn't the place where they advertised their project, I'm pretty sure that the forum helped the project in terms of exposure to the public. I know that there are some altcoins that became scam projects, but to say that altcoins aren't welcome here in the forum just because it's Bitcointalk? It's just an absurd thing to say TBH.