Tonight during the skating even where the Americans won Gold, I noticed a white lens, on a un-named body. I record the events, so I took a closer look, and the "Canon" logo was completely blocked out. It may have been a 7DII, since the skating even is fast, and a fast frame per second would be used.
These have been seen before, probably for the simple reason that non-licensed advertising is forbidden at top sports events so the photogs have to cover any brand names/logos or product specifications.
I have not done the Olympics but do a fair number of major sporting events and have never been asked to cover the Canon logo. The white lens is a bit of a giveaway, and when it rains the Canon rain cover makes it even easier to work out what brand you are using. The same goes for the Nikon users I see too.