They have only raised $1.3m, which they most likely spent a long time ago. They have been profitable (self-sustaining) for years. Sure their stock is not liquid, but there is a strong case that they could move towards liquidation (IPO) at a $5 billion or higher valuation.

From the article:

> Zapier reached $100 million in annualized recurring revenue

They have access to a lot more than a million.