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By the late 90’s most monitors were smart enough to detect when sync speed was too far off and not try to display an image.
It was the old monitors that only supported a single or fixed set of scan rates that you had to worry about damaging. Some could be very picky and others were more tolerant.
This is why you don’t buy any hardware that requires “the cloud” to function with no option to self host. At least they are giving refunds this time, but that’s usually not the case.