WeWork - Applied Research Group - Written offer rescind

Interviewed @ WeWork Applied research group placed out of Palo Alto, CA.
Overall interview process was very smooth. They did a good job to quickly schedule phone screen and onsite to accommodate my expiring competing offer and second follow-up phone conversation for a detailed technical screen (one of the core guys was OOO when I had my onsite).

Team really liked me and extends an offer and after a week of offer negotiation we finally agree upon the final numbers and the recruiter confirms that written offer will be sent once they get an approval from CTO since it’s an out of band approval. Received the offer letter via docusign for me to sign with 5 days expiration period. On the day of the expiration I get an email (around 1.30PM)singed by the Chief legal officer telling they have decided to rescind the offer since business needs have changed. In the mean while I have rejected my competing offer since it was about to expire and I had the written offer from wework which obviously looked much better. With disbelief I called the senior manager of recruiting to fathom what the F**k just happened. He is like, we just realized the scope of the role has been much smaller than what we anticipated and we may not be able to get enough data for you to play and build models, blah, blah …. and hence doesn’t make sense for this role anymore. Seriously, their business needs changed in last 96 hours after extending a written offer to a candidate, albeit they had almost a week to get CTO’s approval for this offer and didn’t cross their mind that you are screwing up with someone career during the offer approval. I can’t believe these construction company morons don’t even have the simple courtesy and professionalism to evaluate the role and candidacy before extending an offer. I have to let go of my other offer because of their incompetency. Don’t waste time on this company, no wonder they are losing $200K/hour.