They probably are and switch their donation addresses frequently. The support that can be given by a community are not to be underestimated, for example, the times I have opened the Monero wallet "Feather" I notice it is a section for people to donate to Monero-related projects and the maintenance of the wallet itself.

The monero community itself fund the development of their wallets and they even crowdfund artwork to bring awareness about the project. "Monero-chan" is their mascot.