My daughter and her business partner are both physiotherapists and run a number of Pilates classes during the week: these are all now cancelled because of the bug, and they, like many musicians and other self-employed people face potential financial ruin.
BUT, they are looking into continuing classes online, using Zoom, encouraging their clients to sign up to this platform. I have seen various references to Zoom in other discussions between musicians who are hoping to keep tutorials and classes going.