That is especially true in 'feature' acquisitions where the company being acquired is going to be a new feature of the acquiring company's existing product. In those types of situations the acquiring company is probably already evaluating the feature and in a 'make' vs 'buy' sort of analysis mode, and even if they 'buy' a company that has built the feature, they really just want the technology and maybe the customer traction, rather than much more than that.
It will be interesting to hear how the Delaware Chancery court sees it but my guess is that they will hold for Twilio unless those redactions obscure some really bad contract work on Twilio's legal team.
They wanted us to meet minimum revenue numbers for 2 years but month after month they (A) wanted to take the bulk of our available time to do their needs and (B) certainly weren't going to PAY for any of that work. Pointing out the incongruent mandates were met with ignorance or "we'll figure it out later" with no later actually happening.
My co-founder and I left as soon as we could and never looked back. Fortunately our earn out wasn't an all or nothing, so we hit a bunch of the milestones and got the bulk of our money. Still a little bitter over the whole thing.
If your company receives an acquisition offer and it includes an earnout, do not sign a term sheet that lacks protections in terms of your ability to meet earnout thresholds. Your leverage decreases once the term sheet is signed. So, if there's any chance to get protections, it's at the term sheet phase.