I poured a concrete basketball court in my backyard 30 years ago. The concrete had shards of fiberglass added to it for strength.
It’s also a great way to get super high.That type of stuff has been around a longtime. A lot more expensive than traditional rebar. Used to be about 3x or more expensive. Special machines to fabricate.
They use it in critical but corrosive environment where you cannot have material breakdown for 50yr+. Nuke stuff, critical infrastructure around saltwater etc.
In 30 plus yrs I've seen that called out 2x and both were military critical installations in the SE amd that is all I can say about that comfortably.
In conditions such as saltwater which is so corrosive to rebar, most jobs would use epoxy-coayed rebar which is probably 2x more than regular steel rebar. Id guess there are no more than 15 companies is the states doing it. Fairly small market
You’ll need lots of heat, some patience, and somebody stupid who’s willing to try the first batch to see if it worked or not
I recommend not being the second person either