I'm vaguely aware of the concept of "bootleg" recordings of concerts, where some sketchy person has somehow sneaked in and plugged in their own tape recorder (or something like that) into one of the audio jacks which are apparently available in the equipment and not guarded in any way (itself strange to me), then snuck back there, removed it and disappeared before anyone caught them. And then sold this to people as a "bootleg recording".
But who would buy such a thing? Wouldn't you much rather want a studio-recorded album rather than the always inferior live performance of the same songs? Isn't the only benefit of a concert that you are there physically? It doesn't appeal whatsoever to me personally, but I can at some level understand why that's attractive to a lot of people, since you get to watch the artist perform it live, in front of your eyes, even if it's much sloppier than the "perfected" recording on the disc you buy in a store.
But if you are just listening to a recording of that concert... what's the point? Who would want, let alone buy, such a thing? Every time I've listened to live recordings of bands I like, they are always complete garbage, and I don't just mean the sound quality. It's like it's somebody else performing their song, but it's the actual artist. Nothing at all like the album. Why would I want to listen to that at home, by myself, "after the fact"?