Except Twitter going down is not as serious as death. The answer to “How much $ is it worth to get an extra 9 of reliability?” is never “Infinite”. So, I agree

Except Twitter going down is not as serious as death. The answer to “How much $ is it worth to get an extra 9 of reliability?” is never “Infinite”. So, I agree with OP, if they can save a big chunk of their opex with a negligible decrease in reliability (measured by something like, how much user churn are we seeing as a result of the downtime), then it’s a good call. I don’t know enough about Twitter’s internals to guess whether this is a good call. A bit off-topic, but having worked at Meta I think it would probably not be a good call there. Infra engineers are already directly incentivized to find fractional-percentage wins, because the savings to the company are often greater than their total comp, and that’s a pretty straightforward way to justify a high performance rating.