I just read the actual appellate brief (found here: https://cdn-files.avn.com/files/2019/2/0/5c65dc9835e98-woodhull-v-doj-fosta-appeal.pdf) and the district court's reliance on lack of standing in this case is a sign of real desperation on the part of the district court judge to avoid reviewing the merits of the arguments that FOSTA is an unconstitutional restraint on free speech.
The judge wanted NO part of that shit sandwich; he would've been forced to either knock FOSTA down (political suicide) or obviously surrender his judicial integrity by making up an argument that would be reversed on appeal. He's hoping that the DC Circuit Court of Appeals will uphold his cowardly dismissal on the basis of standing and thus remove the burning hot potato from his crotch.
The judge, BTW, is a George W. Bush appointee who has been mostly a right-wing hack on the bench. Not entirely, but he sure doesn't want to be the guy who struck down the "anti-sex trafficking" law.
Best hope now is that the DC Circuit Court of Appeals reverses the "lack of standing" nonsense and throws the case back to the district court. Then, hopefully, the trial judge nuts up and slaps down FOSTA for being an obviously-unconstitutional restraint on free speech. In other words, if you're trafficking, then there are already laws against that activity and those fuckers should be convicted and buried underneath a prison. If you're a website that is publishing third-party content (like Facebook or YouTube or TER or Twitter, etc...), then you're NOT FUCKING RESPONSIBLE FOR WHAT PEOPLE SAY ON YOUR SITE. Is AT&T responsible for what people say on the phone? FFS.
If you want to read the part of the appellate brief which describes how FOSTA hurt sites like TER, read p. 10-12.
If you want to read the judge's actual ruling which is the subject of the appeal, it's here: https://digitalcommons.law.scu.edu/cgi/viewcontent.cgi?article=2813&context=historical.