You mean items that should be generic commodities, but which companies customize in order to lock you into their ecosystem, or otherwise restrict what you can do? Like printer ink cartridges or Keurig pods with ID chips, as you mentioned.
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DVD region codes
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Camera lenses back in the manual SLR days. I don’t think there’s any reason old manual-focus Nikon/Olympus/Pentax/etc. lenses needed to be brand-exclusive. The companies could have all used the same bayonet mount and all lenses would be interchangeable.
The British were so focused on whether they could, they didn’t stop to think about whether they should.