My guess is that MarkMonitor is mainly used for their brand-relevant domains (microsoft, office 365, github (main site), etc), as opposed to one that a small su

My guess is that MarkMonitor is mainly used for their brand-relevant domains (microsoft, office 365, github (main site), etc), as opposed to one that a small subset of a small subset of their users of one service will use - I would imagine that microsoft likely owns hundreds of domain names and doesn't pay MarkMonitor to monitor every single one