It's interesting to see someone claim it was FOSTA which brought down Backpage. It actually wasn't. It was the Travel Act (in other words, FOSTA wouldn't have made a difference in that particular case).
Rather, what the feds did, was they waited until right before FOSTA passed to apprehend the people who ran Backpage. They could have done it at any time prior to that, but they waited until there was a big censorship bill already being pushed out the door. Think about that for a moment.