"Pocket money" is a funny thing as they get older. I pay DS £20/week for singing in a cathedral choir because choir and orchestra commitments (which I wanted him to do) meant he could not get a weekend job. I did not want him to see it as "free" money, but something linked to effort. He pays for music tickets and going out from that. He also gets £10/week for lunches, but is often home early enough to eat at home.
I have told him that his university funding will be linked to communicating with us - a minimum level required to keep the money coming. I am not greedy, 2 or 3 texts or emails a week will probably do, but I know that he will not communicate at all if he does not see any need to!