Hard to see how them choosing to charge money to access their server will affect the future of the project, even them choosing to not run a free for anyone server any more wouldn’t necessarily affect the future of the project because the project is not to provide a free for all server but to develop software. Either way, them trying to find a way to keep the server operating certainly doesn’t mean ‘Matrix is cooked’.
As far as Redis goes, as I understand it, they moved their software away from an open source license. There’s zero indication Matrix are going to do the same thing.
Yeah, that day hubris removed several billionaires in one go was a terrible day for humanity.