As long as you have insurance anyone can set up a class.
Ishin ryu ju-jitsu in the south and east of the country is an organisation set up, as far as I can see, just to make money from, primarily, children. They are nothing to do with the British Ju-jitsu Association which is the national governing body.
They start children at the age of 4 and until they are 8 they are classed as infants and progress on the Infant syllabus.
They then become juniors and they start again from the bottom and work their way up until they become a senior.
I run a judo club affiliated to the BJA which is the national governing body for judo.
They have around 150 children attend the 3 different sites I know of locally, I have around 25 members.
They were charging £18 per grading when I was charging £5 and that included a belt if applicable, theirs didn't.
They put on a judo competition each year for their players to practice their techniques. One year I took my players, just out of curiosity you understand, and out of 9 players, each having at least 3 fights each I think we lost 1 fight all day.
None of the grades earnt by the members of this club are recognised by the national governing body of the sport.
The point I am trying to make is that if you can get sufficient insurance and have enough drive to succeed anyone can do it