A tumble dryer is at a completely different order of magnitude of fire risk to typical consumer electronics. In a tumble dryer you have a heating element at a much higher temperature than anything you'll find in a PC, a potential supply of dry dust and lint which is extremely combustible (high surface area and all) and lacking any flame retardant chemicals, and on top of that the circulating air provides an excellent supply of oxygen to turbo charge any nascent flame.
Components in consoles and TVs can and do catch fire, but I guess it's much less often (and not just some bias in journalism). Also circuit boards have been treated with flame retardant chemicals for yonks, so a fire is less likely to spread. In the case of graphics cards, the close proximity of the large chunk of metal otherwise known as the heatsink (and in some cases the backplate too) reduce the risk of propagation even further.
It's a valid concern though that amateurs (meant in the true sense, and not in a disparaging way) can be operating equipment with insufficient care or knowledge to ensure longevity and safety, but ultimately this applies to so many things in life!