Run by the same people, but it’s a separate instance. It might even be somewhat separate infrastructure. I don’t know enough. But I think EMS hosting is on AWS using ansible. And matrix.org predates all that.
Synapse has been very much optimized lately. Dendrite won’t save space on media. Probably not on database, and it hasn’t been optimized for small memory use yet.
“for instance Synapse uses 5-10x less RAM than it used to (my personal federated server is only using 145MB of RAM atm!” - https://matrix.org/blog/2022/08/15/the-matrix-summer-special…
It can be free https://paul.totterman.name/posts/matrix-guide/
Replaced by worse alternatives. We need more nuclear, not less. https://www.eurekalert.org/news-releases/985436