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.
It is fairly common to have people cover logos on televised sports events unless they are a sponsor. There is big money paid for advertising and someone like nikon who pays 2 mill for an ad doesnt want the word canon plastered all over the screen. Some venues dont care but its usually a sponsor that makes the demand in their contract.
Like I said. I cover quite a few globally televised sporting events every year and have never been asked to cover the Canon logo on the camera(s), nor on the rain cover(s) for the lens/camera(s). Not once. And I have not seen Nikon users have to cover their logo either. There is no point. Everyone knows that Nikon lenses tend to be black and Canon white. In fact the colour of the lens is far more obvious than any miniscule Canon logo on the body.
We do have very strict regulations on what we can do with the pics, what we can wear etc (most of the time given a bib anyway). But nothing to do with the camera's brand, there's no point.
Just watch any sporting event and try to actually read the name of a camera brand on a photographer's camera. You can't unless you really, really, really try. What you can see is what is white and black.