Earlier quoted context omitted.
Desktop Linux has always been a house of cards in regards to security. I agree it's amazing that it went on for so long, but this was inevitable.
More so than, say, Windows? Really? And no, "people using one Linux distro can opt in to possibly getting pwned by each other by making use of a third-party software depot" does not reflect upon the entirety of the Linux world.
There are more ways to attack people than third party software depos.