If you are not causing embarrassment or other harm (in Google's view) you are probably pretty safe unless you are entering or likely to enter a major business deal with Google. In those circumstances I wouldn't want to risk Google reading internal communications.
This means any startup even open to acquisition should probably avoid hosting private communications with likely buyers including Microsoft, Google and Facebook. When millions of pounds may be on the table it just isn't worth the risk that somebody in the big company decides they want an advantage in the negotiation.
This means any startup even open to acquisition should probably avoid hosting private communications with likely buyers including Microsoft, Google and Facebook. When millions of pounds may be on the table it just isn't worth the risk that somebody in the big company decides they want an advantage in the negotiation.