if I will invest 10.000 usd (just an hypothesis) and if one or two years later I will have 15.000/20.000 back I should be satisfied. but if I invest 500 or 1000 I expect an exponential growth.
I don't know if this is the right project for an exponetial growth, honestly.
growth it is not just linked to number of users or premium users, so it is possible to have a huge growth in next years.