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The very best will have jumped at the time of purchase so they could get the prime jobs elsewhere, before the rest started leaving.
The other issue is it's an established company so retaining knowledge is usually really important.
When you're building a business you can try to put in plave the right architecture and work things as you grow. With an established one you've got so much legacy stuff that even if there are issues with it, to start you need people who know what they're doing.
I can see the vibes behind that sentiment, and if you're a small business trying to grow I think that's what you need. But surely for an organisation the size of twitter you need the opposite?
Although if the company could run on 1k people i guess it's achievable.