Not them, but my employer makes it a major PITA to add non-standard repositories on the corporate Ubuntu image because of the weird and non-standard way Apt is configured. The "docker.io" package available in the official Ubuntu repository is typically horribly out of date.

Additionally, (and admittedly this isn't really Docker's fault), the default IP range for Docker's network happens to conflict with my employer's internal network, which is great fun to debug if you forget to change it.