Leading to the Meltdown, Zombieload and Spectre exploits... Some of those may have been other side-channel effects.
Side note: The only project I have worked on that used Apple equipment used the original Mac toasters for some purposes. It was the only machine that met the TEMPEST requirements of the day. I doubt that was Apple's intention.
That was c. 1985 and the Russkies were out in the bushes trying to steal technology. Fast forward to 2022 and the Russkies are much more sophisticated when the pwning government data.