There's always a risk of abandonment, no matter the vendor. A more important question is what sort of lock-in you're facing. What are you left with if the proje

There's always a risk of abandonment, no matter the vendor. A more important question is what sort of lock-in you're facing. What are you left with if the project fails? Mozilla tries its damnedest to avoid locking people in, and promoting open, standardized solutions. Persona provided verified email addresses for your users, so there was no intrinsic barrier to migrating off of Persona and to, say, a traditional email + password login scheme. With Firefox OS, building an awesome FxOS experience was synonymous with building a great mobile web experience, because the foundation was in open, standard technologies. Even if FxOS went away, you're left with something great that works in other browsers.