I think you're dramatically underestimating the scope and scale of the problems Twitter had to solve. See the thread below for examples of the sort of solution

I think you're dramatically underestimating the scope and scale of the problems Twitter had to solve. See the thread below for examples of the sort of solutions they had to build because open source or cloud-hosted solutions weren't available or viable. https://mobile.twitter.com/danluu/status/1592774269733601281 https://mobile.twitter.com/danluu/status/1592774269733601281