I just pretty-printed the largest JS file loaded in their homepage. The result doesn't look obfuscated by any means.

Removing whitespace != Obfuscating

Don't take their claims at face-value, get your facts straight.

Disclaimer: I'm not claiming that obfuscating (or not) makes any difference with regards to MS infringing on their codebase, just pointing out that it's not actually very obfuscated as claimed by their developer.