No one ever starts these things with plans to shut them down, the question is how much money do you have for this right now, how much money is it burning per unit of time, and how long will that last if no one pays for a paid plan. I'm not asking you to answer those questions, but pointing out the reality of the economics of the situation. If an image goes viral, can you pay a 10x or 100x hosting bill? For how long? How much are you commiting to spend before shutting it down becomes an attractive option?