The difference I see is traduora looks like a project, not a company. Sell support! Don't give it away for free. If someone asks me for a bugfix, I show them the ticket in our open backlog & tell them if they want it done faster, they have to pay. Seeing their concern turned in to a ticket shows them that I care, but telling them I prioritize paid fixes tells them it's not a charity. Don't let them feel entitled.