Yes, but Mozilla, like Signal or Wikipeedia, etc. is a software development project, not a protocol development project. If you donate to Mozilla, you expect to see software features coming out the other end.

Nostriches, who are users, feel like part of the protocol. That's why the merchandise, meetup projects, marketing, is coming primarily from users, not from some foundation. That's the main strength of Nostr, after all: it's not a software project, it's a communications protocol project, so everyone who uses it to communicate, is part of the project.