I’ve been to a horror con a few times in recent years, and it’s a mix of legit titles, region free discs of unknown origin, (at least to me) and then bootlegs of films that have never seen a legit release, and workprints. All really depends on the seller.
The bi monthly comic con I used to attend up in L.A. back in the 90’s was the Mos Eisley of bootlegs though. Got my first copy of the Holiday Special there. A smaller local con I attended in 2002 had at least one seller brazen enough to be offering an AOTC VHS bootleg that was probably shot off a theater screen.
But that’s what I’m saying: it’s not “brazen” in the least. It’s commonplace and expected. That’s the way it’s always been.