A senior US investigator says it is still easy to find child abuse images that have originated on OnlyFans.
The online platform told the BBC it had acted to tackle illegal content and it was impossible for them to verify claims without evidence.
But an investigator said images of young children apparently being exploited could be traced to the site.
A BBC News investigation last year revealed children had sold and appeared in videos on the British website.
Leaked documents also showed moderators were allowed to give multiple warnings to accounts posting illegal content before deciding to close them.