Why would WeWork be involved with the staff of the company they hired? If Commercial Building Maintenance Corp laid staff off having lost a contract, it isn't WeWork's responsibility to let their staff know. Would WeWork even know to tell them?
Update: If you read the comments section, there's a reply from a WeWork staff member: "WeWork's contract with Commercial Building Maintenance Corp expired, WeWork was no longer a customer of theirs, and instead of CBM giving their staff the bad news in professional manner, they let their newly-unemployed staff members waste time and subway fare to be informed of this via disabled keycard."
The workers maintain that WeWork dumped CBM because CBM's employees joined a union. That might indicate that WeWork would rather not deal with employees who are in a position to collectively negotiate for better pay and benefits. Now that WeWork has hired replacement employees directly, we'll see whether these new employees try to unionize too.