Also, as someone who was the victim of a pretty awful violent crime I'm here to tell you that police are not the enemy. There are some really bad people out there, trust me.. if you ever met one you would probably be okay with cops violating their privacy.
It becomes "well we need to scan websites to make sure there's no X, Y, or Z, and prosecute the site operators who don't cooperate" real fast.
If the software hacks the phone first, but only releases the information later, while marketing itself as simply "preserving the device state", they can point at that marketing and say "we're just preserving evidence while waiting for a warrant", despite the fact they've actually already broken into your phone.
I don't know what you're not seeing here. Even the most honest and fair cop would love to "preserve evidence" while they wait for a warrant - they already turn on airplane mode and put devices in a Faraday cage, sometimes they even put them to charge so they stay AFU until they get a warrant. To them, such software is just a natural extension of that, after some manufacturers added auto reboots.
And from the software vendor's perspectice, it nakes perfect sense to take advantage of AFU, hack the phone, dump it or install a backdoor to "preserve AFU" and then pretend to hack it once the cops click "I have a warrant now". It's a great business model - it solves a real problem, it gives you a competitive advantage, you aren't even technically lying, just not telling the whole truth.