Why is Vive suitable for a startup that wants to offer a pension?

Because you can start small without locking yourself in. There is no minimum number of participants, no mandatory collective and no multi-year contract. You decide who takes part and how much you contribute, and adjust as you grow.

Employees build their own pot that moves with them when they leave, which is attractive in a market where people switch more often. See the setup on pension for employees or read how modern agencies arrange their pension.