Because if you did you should know that updates are constantly happening...
The service is identical to 2009 or something as far as I'm concerned, and still appears broken as far as video embeds go to this day. It's one of the heaviest and slowest loading sites I can think of.
This is not an endorsement of Elon or anything he's doing with Twitter, but Twitter's core product is not complicated. For some comparisons:
Rumble has 35 employees
When WhatsApp was sold to FB in 2014 they had 55 employees.
WeChat has about 1400 employees.
My guess is you could successfully run Twitter with a few hundred employees.
With direct response, even data-naive decision makers can figure the value of.
WeChat has always been part of Tencent. It was piggybacking on the infra of what was already one of the biggest tech companies in the world. That's like comparing the number of Gmail employees to Twitter, sure it serves lots of users, but it doesn't have to worry about so much of what a standalone company has to deal with
WhatsApp/YouTube were in the same boat when purchased. Good at getting active users but monetizing takes a lot of employees and they hadn't tackled that yet when acquired