Anything scrupulous that would give you recurring revenue. The sky is the limit, with the exception that it shouldn't be illegal/immoral. Of course, that's op

Anything scrupulous that would give you recurring revenue. The sky is the limit, with the exception that it shouldn't be illegal/immoral. Of course, that's open to wide interpretation, but there are obvious things you wouldn't want to do... if it was exploitative, for example.