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This is true. A few years ago I lost the keys to the Thule lock which was securing a friend's MTB in place. Couldn't find them for love nor money. Went to Halfords, bought a flat-blade screwdriver and a lump hammer, and had it off the car in under a minute in Halford's car park. They're essentially the same as a café lock - they'll stop an opportunistic thief, but not someone kitted up for thieving. Still, I can't think of any bike rack that would be more thief-resistant.
do not rely on the security of Thule bike carriers
https://www.youtube.com/watch?v=WB4ThUOTT0s