Don't think you're Google and you have money to throw away... they only do that because they do have money to throw away, but they know that this kind of expense may, in very rare cases, pay off later as they find a market worth exploring further... you don't have that luxury. Indie developers offering free services which actually cost them money only makes sense if they have proven plans to "convert" most free users to a paid plan, otherwise you're literally donating services to your "users".