Following the example of GitLab and other VC-funded open source companies, @element goes 'open source almost everything' with "Synapse Pro";
"Synapse itself remains open source, and Element will continue to develop it proactively, just as it has for the last 10 years ... Available under a commercial license, Synapse Pro will help fund and accelerate the continued open source development of Synapse for the benefit of all of Matrix."
https://element.io/blog/synapse-pro-slashes-costs-for-running-nation-scale-matrix-deployments/