That's true but there's some missing attraction that's present in fast-growing startups but not here - there's little room for big stock / options growth (unless Musk provides options at less than the $44b price, or a high all cash comp) and the product is already mature so lots of interesting engineering challenges are already solved (and your challenge will rather be to figure out the existing codebase and how to work with it). There's also less of a promise of lots of fast hiring and moving up the chain as I imagine Twitter wants to remain fairly lean.

Of course there's plusses too including working a large impact product with little bureaucracy and being on a even playing field versus your peers with little institution knowledge.

I guess what I'm trying to say is it's dissimilar to a fast-growing start up in important ways that attract people wanting to work for you.