[YetAnotherNick]

Because Amazon was spending on R and D. AWS came as a result of that. Amazon's core business was known to overspend(still do) just for customer's satisfaction, and it was very clear Amazon could turn into profit any day they want. Same is not the case for Twitter.

[kevinh]

Twitter spent more than a billion dollars on R&D in 2021, which more than eclipsed its net loss.

[yazaddaruvala]

Difference is Amazon spent a lot of it on durable infrastructure (datacenters, servers, fulfillment centers).

I don't know how Twitter spent its money, but seemingly on undifferentiated software (i.e. not durable) or moderation? Both of which are recurring expenses.