🚨Nation-scale Matrix deployments will fail if built on the community version of Synapse.
The community version of Synapse is not designed or intended for use by commercial Matrix hosting providers to serve huge nation-scale deployments. Just as a suspension bridge has a weight limit and will collapse if you exceed it - the same goes for community Synapse.
Deployments supporting millions of users need Synapse Pro.
https://element.io/blog/scaling-to-millions-of-users-requires-synapse-pro/