The plasma TV's were Radio Frequency Interference generators (RFI) and among the worst things ever. The FCC banned them IIRC because of it. Any ham radio operator in your neighborhood knew exactly when you turned it on every day as the noise wiped out his radio. Verboten
I've never heard plasma tvs were banned by the FCC. It's my understanding they were discontinued due to lower consumer demand since they were more expensive to buy, used more electricity and weren't as bright as LED TVs in a store showrooms. By today's standards, they still produce one of the best TV pictures in a TV. The blacks aren't as inky black as OLED, but close enough.
Whatever the reason, I'm not a fan of curved or LCD/LED TVs. A curve screen has more distortion and the sweet spot for watching a curse screen is even smaller compared to a flat screen TV. OLED would be my choice if buying today. Micro LED will be the best of both LED and OLED when it goes into mass production. But last I read, they were having a difficult time mass producing the panels to make it a viable product.