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I'm surprised nobody has done the FEA analysis to show this, although I'm guessing Canyon have, hence why they're saying not to use carbon bikes on a turbo.
I can only assume that if they did their analysis was just due to the fact that a large amount of their frame was sent back for cracks and failures. Without having any physical shop where their people can assess the issue and understand clearly what caused the problem they have to cut the loss by limiting warranty replacement as much as possible.
I wouldn't be surprise if they start to say that their bikes are not intended to be used on rough terrains and damaged tarmac and because of that they won't replace any bike that has been used on an enclosed racing track.
Breso
Frames are designed to withstand an inherent amount of flex from a 100kg bloke giving it some gigawatts but when the same bloke is out of the saddle, giving it some beans in his garage with the back axle completely fixed in place the force has got to go somewhere and these forces will probably end up somewhere around the BB / seat cluster. Carbon will have a safe working load that will never be exceeded under regular use, but it's possible when fixing one point that the stresses get a bit close to this point for Canyon to be happy with. I'm surprised nobody has done the FEA analysis to show this, although I'm guessing Canyon have, hence why they're saying not to use carbon bikes on a turbo.
I've never felt confident using carbon frames on a turbo due to the reasons listed above, I'm surprised more companies don't follow suit, especially with Zwift types hammering it inside nowadays as opposed to a steady sat down turbo spin.