OTP fuses can be made in any technology, either poly or aluminum.
Similarly any such fuse can be characterized. But then you start to
care about reliability, regrowth / marginal blow, and the circuitry to
sense fuse state and protect anything else attached, from the blow-
event (flyback voltage on opening, etc.).
This may be where the foundry has reached initial success and then
stopped; I have worked fuse "bolt-on" developments where
everything was going fine, not a single failure in programming or
small-sample tests. But a new product development director did
not want to hear about the $40K to rent lifetest oven space for
the needed 1Khr qual, and killed the project - screwing a family
of products as a result. All good for him, though - got made a VP
(for what, I couldn't see) and then shortly he was on his way to a
new company leaving only a mess.
The fuses never did get qualified.