I'd say almost certainly. Most of the adapters are just junk.
Definitely. Mostly unfused, flimsy, almost never grounded (and an ungrounded adaptor allowing for contour plugs turns quite easily into one for Schuko plugs if it's used with some more force... so why not build something decent when you already have the components in your junk box? Ok, the chinese BS1363 plug was probably a bit questionable... but it survived the hairdryer without any signs of overheating. Being old of course they didn't have sleeved pins, but I guess a lot of those are still around.
