No offence but that sounds a little naive. Twitter isn't just the app and feed algorithm - I imagine there's more that 500 people needed to run the advertising side of the business alone (multiple countries, different tax regimes, payment processing, big customer relationship managers etc). Even the low level data centre, network engineering will number into the hundreds.
And they'll still have some kind of 'manual censorship organization' to enable them to operate legally in different countries, handling people posting illegal content and responding to law enforcement requests, bot detection, reports of harassment etc - that's going to be more than 500 people, for a company with the number of users Twitter has.
And they'll still have some kind of 'manual censorship organization' to enable them to operate legally in different countries, handling people posting illegal content and responding to law enforcement requests, bot detection, reports of harassment etc - that's going to be more than 500 people, for a company with the number of users Twitter has.