Silly thought: Apply for a patent? As a developer, I do hate that Apple frequently "Sherlocks" indie developers. I do think that, out of goodwill, they should provide fair compensation in such situations, but there are legal issues with that - opening the possibility of future legal action, particularly if the offer of compensation is not accepted (e.g. if Blix says that feature is worth US$1 Trillion). I do think Apple could offer a technology licensing arrangement without admitting guilt somehow.Still, even if Apple were to license the technology from Blix, since they don't have a patent or any kind of trade dress, another company could sue them for the same thing the next day; then, the fact that they paid something to Blix could be used against them with that next company.
But, this is a suit from a patent troll who is pretending to stand up for other developers to gain positive publicity for their trollish ways.