It's really up to the artists. Many are surprisingly cool with it, though there are a few notable exceptions (i.e. Prince). Sounds like the artist in this particlar case gave their blessing.

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)