Apple basically found a way to game the system and ended up with a design that had fewer compromises and lower cost (on this front). I've heard several interviews on ANTIC The Atari 8-bit Podcast with various designers of the Atari computers who were very frustrated at being compelled to design their computers like a tank while Apple largely, in their view, just ignored the FCC and got away with it. Wikipedia has a more generous take on the situation, but even Wikipedia concedes that Apple was exploiting a loophole in the regulations.

Later, the FCC did relax its requirements, but by that point, Apple had established itself as the dominant player.

Links:

https://en.wikipedia.org/wiki/Atari_8-bit_family#FCC_issues

https://ataripodcast.libsyn.com/