You propose just to buy servers in 2 locations to keep Slack services up? Doesn't work, when you need to store gigabytes daily and have dozen thousand reqs/sec

You propose just to buy servers in 2 locations to keep Slack services up? Doesn't work, when you need to store gigabytes daily and have dozen thousand reqs/sec synchronized. Geodistributed datacenter requires multiple direct low-latency multigigabit/sec connectivity, special software to manage, test and check it, skilled devops.