Not a lawyer, but c) is almost certainly illegal. Gambling of any kind is heavily regulated and restricted. As to a) or b): it's not impossible to run a consul

Not a lawyer, but c) is almost certainly illegal. Gambling of any kind is heavily regulated and restricted. As to a) or b): it's not impossible to run a consulting company, but then you'll end up running a consulting company, competing with all other consulting companies. Competing on cost alone is not a good idea.