Many bands (like GD and Phish) specifically note in their rider that venues must allow and provide space for tapers to bring their rigs in.
A sibling comment in this thread pointed out my project Relisten[0], which now has over 4,000 bands who have given explicit permission for people to tape, record, and share their concerts non-commercially. We've been operating our FOSS platform for 12 years, and most of the audio is hosted by Archive.org. I can't tell you how many bands have begged us to add them to our platform.
[0] https://relisten.net (https://github.com/RelistenNet)
(The 4,000 number will be coming to web soon - it's available today on our mobile apps)