I worked at Twitter and let me tell you that's not how it works. When you whack most of the engineers out of the company, and if it still continues to work, that doesn't mean you don't need that many engineers. It means the following:
1. The ones remaining are practically working 24x7 every day for essentially the same pay, with the promise of more.
2. You keep falling behind on all the things you need to do to keep things alive and compliant. This eventually comes back in the form of outages or worse, FTC fines.
3. There is very little room for forward looking work, which means you are sacrificing opportunities for growth. E.g.
> 325 million active users in 2015 and it's still about 300 million active users today
These were two very different numbers. The numbers in 2015 were DAUs and the numbers today are mDAU. mDAU are in layman terms users that can be monetized. This number was ~180M in 2018, so the growth was there. Part of the reason why the ad revenue was growing for Twitter during that phase.
4. Safety and Trust on the platform drops quite a bit when you are understaffed. Regardless of your political beliefs or whether you're team Elon, when there are 10 people banning CP instead of 100, there is no way you could argue objectively that the platform stays the same.
There's plenty of other problems, but you would not know they exist unless you're one of the people left after the figurative massacre.