Kol isha in kosher restaurants?

Why do many kosher establishments play kol isha, and do you guys think this is a problem? I understand restaurants that just happen to be kosher certified and that aren’t owned or run by Jews would play whatever pop music they want to play etc, but if it’s run by Jews and the customer base is primarily frum Jews, why would they be playing kol isha? What do you guys think about this? I’m MO, I don’t personally have a huge issue with listening to recorded music (unless it’s specifically sexual in nature) (I also watch live theatre) though whenever I’ve been to a kosher restaurant and they were playing kol isha, I’ve thought it to be weird regardless of how I personally hold, especially when I can see other frum Jews there who I can tell definitely hold by kol isha stricter than I do

Edit: I’m not saying the music has a sway on the kashrus of the establishment, more just shouldn’t it be avoided as a courtesy when your customer base is mainly frum Jews? Wanted to hear others’ thoughts on this is all