Gregory's Server@aral i ask that question all the time and it's amazing how often you're seen as an idiot for not clearly seeing <mischievous earning structure here> as the obvious model.
Even though it's often possible to just have a subscription model and have a fair pay-for-when-it-costs-us system. Optionally supported with privacy respecting ads, to keep it affordable for much more people.
@aral @dynom And sure, soms might require some additional funding if a product/service needs scale to get otherwise affordable. But, and I know I'm preaching to the choir here, sustainable earning models are the way forward.