Taking a huge buyout then trashing your acquirer for PR points a few years later seems in poor taste. They knew exactly what they were getting into when they accepted the FB megabucks.
Presumably he feels that Zuck is reneging on his verbal agreements made during the acquisition process. Speaking out publicly is the appropriate recourse.
Zuck fucked them and the regulators over when he promised to keep WhatsApp independent.
The sale would have never gone through if he hadn't promised that.
