Of course they can try that.
But it doesn't make a shred of sense to assume that Apple would spend several years of aquisitions, recruitments and development to develop infringing IP now does it?
It's been alleged at times that large players have done something to the effect of infringe, profit massively, outlitigate/settle. Sour grapes might play into it, but Transmeta sued Intel over later versions of Speedstep that behaved like LongRun.
Intel settled for $250 million.
Assuming that isn't the plan, the general algorithm is to develop technology as blindly as possible to avoid treble damages for intentional infringement, then play the game of cross-licensing mutually assured destruction if working in an interdependent industry like tech.
One of the claims for deliberate infringement in Apple's massive patent loss in the WARF case is that it cited the patent it was sued over as prior art in a filing.
The big players cross-license or settle, because of course they're going to infringe on something when everyone makes thousands of broad-as-possible patents in a year, or there's a non-zero chance a court is going to stretch a patent sufficiently to find them infringing. Generally, you don't want evidence that you were looking since a loss after looking raises the chance of a finding it was willful infringement.
Particularly since they have very intimate knowledge concerning IMGs IP, from a licensee perspective, from an owner perspective (they own a major stake in IMG, you think they don't know what they own?) and from a creator perspective, since some of the people involved in the development of IMGs portfolio are now working at Apple.
That's what makes it extra dangerous unless Apple licenses something from somewhere. If they used their intimate knowledge as best they can to not infringe, and they mess up a little (or a court does), it's up to 3x worse.
A possible injunction could cost Apple more than a settlement as well.
It makes every bit of sense that when they spend the effort to develop in-house technology, that a primary design goal is that they can freely deploy and modify it, hell being independent is presumably the entire point!
They can do all of that, but it's still not up to them whether they are found infringing on someone's IP. Developing purely in-house just means they don't know if they're infringing, or if they'll be found infringing.
Honestly, whatever funds IMG can liberate are probably better spent betting on horses than betting against Apple in this case. Their stock is still listed though. Anyone who thinks IMG is going to make a killing from litigation are free to buy their shares. Apple are probably prepared to sell theirs.
A bad outcome is IMG dedicates itself to suing Apple and its record 25 billion dollar cash reserves that it will argue couldn't have happened in a large amount due to IMG.
The actual industry nightmare is if IMG implodes.
IMG would be familiar with a way out the nightmare scenario, since it was done with MIPS when MIPS sold much of its IP to a consortium that promised to insulate the big players from litigation from trolls.
That netted $350 million.
IMG could move to sue Apple, and if that fails it can threaten set up a lawsuit bomb for everyone.