If I allow people to use my proprietary indicator and share their profit if any, whether this is Ok?
If you want to advice then one should have RA/RIA license and charges can be based on AUM or can be fixed fees but should not be based on profit sharing.
If not as adviser, in this case I guess one can charge saying fees for providing tech or some services etc. but not sure based on profit sharing.
It would probably be better to raise invoice as SAAS or technical consultancy service.