Is Vaults.lol a startup that could shut down?

No. Vaults.lol is not a venture backed startup with a runway to burn through. It is an independent project, self funded, with no investors and no board deciding whether link in bio pages are profitable enough to keep alive.

Costs stay tiny because media is embedded from URLs instead of hosted on our servers, so a busy profile costs us almost nothing to serve. The €5 Lifetime and €9.99 Supporter payments cover the running costs. There is no pressure to hike prices, gate old features, or sell the product to someone who will.