Nothing is wrong with making a bit of money. However, when the barrier to entry for providing a service is low you have to be _very_ careful about making that

Nothing is wrong with making a bit of money. However, when the barrier to entry for providing a service is low you have to be _very_ careful about making that money by negatively impacting the user experience. If you make money, that's fine. If you make money by taking advantage of users, you can't really be surprised when a competitor pops up and users leave.