In fairness, some of those are quite a stretch. Sure, there are vague similarities (colours, approximate shapes) which might have given you a sense of familiarity but I wouldn't say - for example - that moby and docker were that similar despite the familiar artistic styles. For starters, they're not even the same animal.
My point is that if you started a containerization startup called Moby using that logo, people would be upset.
Docker doesn't own whales in the same way Apple doesn't own the concept of apples (as much as they'd like to), but using "inspired by" logos in the same context as the logo you were inspired by can cause problems.
