Sort of. One the one hand theoretically enough people will pay for it to keep it running so they don't need to resort to spammy tactics to acquire users at all costs. On the other hand they are 100% in the business of acquiring more users as proved by the addition of free accounts. The invite process for getting new people into free accounts is pretty darn viral and the number of people using App.net has increased by over 75% in the past 3 weeks.
