The Apache Foundation is organized as a legal entity to host projects, but is intentionally decentralized. Because they have chosen to organize themselves this way, many large companies have chosen to work with them to host collaborative open source projects they care about. It fills a very different niche than Mozilla.

Looking at the revenue of the Apache Foundation is about as misleading as looking at the revenue for the Mozilla Foundation. In both cases, development is generally funded through corporations, though in the Apache case the corporations are independent while in the Mozilla case the Foundation owns the Mozilla Corporation.