Thanks @Richard again for the quick response. And thank you for the great work on the Laytheme!
I thought about my problem for a while longer, and then thought that the Laytheme already has the solution ready. There are already settings for mobile under "Customizer/Project Thumbnail/Project Thumbnail" Mouseover. But unfortunately all three possible settings have no effect on the "Video Thumbnail Behaviour".
The consequence is that on mobile the videos always run, even if you had specified "Video Thumbnail Behaviour" "Play on Mouseover". My smartphone then reaches the limit with ~10 videos playing at the same time and crashes. 😞
Here in the video you can see the described problem:
Is this known or even intended?
At the moment, this is kind of a show stopper for us and would mean, that we would have to switch completely to static images. Do see any chance to fix / work on this soon?