I was replying to your previous comment that Matrix as a protocol is not suited to chat by pointing to the millions of people who use the service as a means to refute the point.
The Matrix.org Foundation is a non-profit UK Community Interest Company. As you might expect, it accepts donations which can be used to fund work on the project. It reports publicly on its financial status in the same was as any other UK CIC is obliged to. This doesn't seem very controversial to me.
You can see numbers for the public network here (https://matrix.org/faq/#what-is-the-current-project-status), though these figures do not include installations that choose not to federate publicly.
The Matrix.org Foundation is a non-profit UK Community Interest Company. As you might expect, it accepts donations which can be used to fund work on the project. It reports publicly on its financial status in the same was as any other UK CIC is obliged to. This doesn't seem very controversial to me.
In any case, should you wish to donate yourself you can do so here https://www.patreon.com/matrixdotorg