Of course a single user is irrelevant, but in principle and if it would evolve into a larger trend: yes.
At least if the dev wants to keep paying his bills. That is how business works. And with lower user counts at some point the required price per user would be too high to be competitive. Then the dev would have to abandon the project, since it would not be profitable anymore. He is a full-time developer after all.
Uh huh so according to your logic now that I wont buy it like I planned to, you and the others will have to pay even more? Good luck
Of course a single user is irrelevant, but in principle and if it would evolve into a larger trend: yes. At least if the dev wants to keep paying his bills. That is how business works. And with lower user counts at some point the required price per user would be too high to be competitive. Then the dev would have to abandon the project, since it would not be profitable anymore. He is a full-time developer after all.