This is a tough one.
I wouldn't worry that much about employability. If you're honest, hardworking, and love writing software then I don't see any issues there. I'm sure you've solved enough hard interesting problems that'll carry over to other industries. It's all about moving bits anyway. You'll even have a leg up if you have a better than average understanding of security.
You may be holding yourself back because it does take some time to ramp up in a new "vertical" (so to speak). Building new professional connections, etc. So like... maybe in an alternate universe you'd be working your way up the ladder at Apple or Google or whatever. That time invested does pay off and there's an opportunity cost there.
The tough one is the ethical question. Sometimes it's hard to tell if our disillusionment is internal or external. In other words, is it nagging you because you can see why the public is negative towards crypto or is it nagging you because you don't want to alienate yourself from the crowd?
If it helps, I've long held the strong belief that I should wake up in the morning guilt-free about my job. I need to feel excited about coming in to work and tackling the next big problem. I refuse to work for or with jerks. I refuse to work on products that aren't striving to make things better. I refuse to work on exploitative or manipulative products. I refuse to work for unfairly low pay. And all of that positive energy (great product, great people, great mission, good/great pay) make the dark/hard times easier to manage.
In the long run I feel like this philosophy has made me a happier and more successful engineer.
EDIT: Just to give you an idea of how I applied the above philosophy. I once quit a well paying job in the very first month because a senior engineer was an insanely venomous person and no one seemed interested in stopping them. I didn't make a big stink about it, just quietly moved on. The next job I found was amazing and I'm so glad that I did what I did. Yes it was scary.