[wyldfire]

> does anyone have knowledge that this occurs

If you have any doubts, click on the padlock icon using your browser. On Chrome, you can click "Connection" then "Certificate Information". It will display who the certificate was "Issued By" and "Issued To". Well-meaning eavesdropping corporations will likely confess their [or the device's manufacturer name] identity here.

[partisan]

There is a good article in the current 2600 paper issue describing the issue of corporate MITM and why simply looking at the certs for the current site might night be enough.