In the USA, any place that serves alcohol is required to have at least 12 large screen televisions, all tuned to different stations, mostly sporting events, plus rock music playing from a radio station or music service. With all that noise it would be difficult to sing folk songs.

Even a place that doesn't serve alcohol (and therefore doesn't have to pay enormous fees to the state for a license to do so) still has to pay a minimum of about a thousand dollars a year to ASCAP, BMI, and SESAC if any music can be heard there. It's difficult to cover that overhead without a lot of loutish people buying alcohol at inflated prices.

Gathering in homes to sing or hear folk songs is seen as a way to avoid the music mafia fees. But it probably won't last. Just as they gradually shut down the coffeehouses, they'll eventually shut down the house concerts. In a few years we'll hear about people being sued for having a birthday party for their kids and singing Happy Birthday without paying those minimum annual royalty fees.