I get to evaluate a lot of blockchain related pitchdecks, and the first thing I look for is always whether they want to insert themselves as a central clearing house in some form, and almost all the startups I see that has put blockchain somewhere does that.

If they do, that's an instant huge red flag indicating it's probably there because they thought blockchain would get investors excited, not because they have a vision that need it.

A very, very few are using blockchain as a way to enable something larger, by e.g. trying to create an ecosystem where they themselves are just another untrusted player, where blockchain can make sense. And of those that do that, an even smaller number has done that in a way that seems like it's creating a bigger opportunity for them instead of shooting themselves in the foot.