Litecoin, Cardano, BNB, etc. all have maximum supplies too, but Bitcoin has first mover advantage, as well as the most hash power. Some people argue that makes Bitcoin the most secure cryptocurrency, while others say it has a flawed security model. I may be wrong, but I think it's 1.7 trillion dollar valuation has distracted many people from noticing its flaws.
At the end of the day, cryptocurrencies are like religions and the strongest ones will keep growing, especially during the bull-runs. Those that eat the world will be censorship-resistant, have predictable supply curves, innovate, and above all build resilient communities.
There's still plenty of world for them to eat.
There is no first move advantage.
If anything it's a disadvantage.
Look at all the people who won't get into Bitcoin because it's "too expensive" or "low tech".
Look at Myspace and Netscape; did they have a first move advantage? Nah. Crushed.
ADA and BNB can't even be on that list because they aren't mined.
BNB is more of a stock 2.0 coin... well at least before the EVM network came into play.
LTC is a decent example though.
It's a great example of how people do not respect POW technology or understand the value or usecase.
They'd rather jump into some new thing that promises the world and never delivers.