As a student in the 90s I worked security for the student concert group on campus. We had to frisk people for Jello Briafa (Dead Kennedys) spoken word performance. I found a couple of tape decks, but those were allowed.

They still put a lot of effort sometimes. I saw Dave Chapelle in NYC and they made us put our phones in these pouches which were unsealed on exiting the show.

Effort is still being put into it. Just this weekend YouTube put the 4K Coachella streams behind SABR. I could still get 1080p easily but 4K required some fanangling.