I think this effect certainly plays a big part in slowing down progress on fundamental research in an otherwise hyper-active field. But the good thing about open technologies is that they can act like neutral tools and not neighborhoods.

Decentralization allows anyone to start their own bubble with however much curation they want. If you want crypto without scams, it's very easy to achieve. Let's not forget how terrible a reputation the whole "world wide web" had just 2 decades ago, and yet here we are complaining how locked-down and ultimately "too safe" it has become.

The space will change with more regard for fundamental aspects of the platforms' technology, than transient feelings about its current ecosystem.