Shiona McCallum meets a medical expert testing out the future of prosthetics.
YouTube said it worked with experts to provide appropriate experiences. TikTok said it was disappointed Ofcom had not acknowledged its safety features.
The trial had been set as a test case for 1200 other school districts making similar claims.
The NCA and NPCC say children should be blocked from accessing sites which do not stop them seeing nudes or being contacted by strangers.
Frustration with fake dating profiles has spurred new dating services with different approaches.
It comes just a day after the firm revealed plans for a record-breaking stock market debut.