I think Kopech could become a valuable piece of he shows extended flashes of success.
Pham - also yes. Would be worth a B-level prospect to a contender.
Crochet could be valuable to a team who thinks a) he's a shut-down reliever for 2024; and b) he can be effective as a starter long-term.
Being a "former top prospect" will keep you from completely falling off the face of the earth, and someone will give you another shot. Someone will give you a minor league roster spot or an NRI to spring training to see if you can capture whatever it was that got you noticed to begin with.
It won't help bring up your trade value as a big league player.