I get you think the word is too heavy but remember: it's a small business and bad press is a serious thing. It could be enough to shut down the place. Just see

I get you think the word is too heavy but remember: it's a small business and bad press is a serious thing. It could be enough to shut down the place. Just see how afraid local shop owners are of Yelp. You get review bombed there and you have a serious problem. You don't know if these artists won't just unload their (just) frustration at AI on the business exactly like that. By judging the tone "change or I'll tell the artists", it's very likely the person would try to incite them instead of just "telling" them.