A startup made for the purpose of acquisition was never a competitor. If you are willing to sell to the big player in your industry you are not competing, you are an opportunist. A startup that wants to compete will run very differently from a startup that wants to be purchased.

A big whale company that gobbles up some of the fifty startups that only have like 2% of the market total is not a competitive market at all.

It's not a simple "acquisitions are good" or "acquisitions are bad" discussion. There is an ideal amount of M&A activity in an economy which is more than "no startup ever gets acquired" and less than "every startup is bought out by big tech". In recent years we have been closer to the first extreme, and very few startups have had exits of any kind.