A ‘seizure’ of property requires ‘some meaningful interference [by the government,] with an individual’s possessory interests in [his] property.’

Apparently the government doesn't think disposal of property is included in you "possessory interest". Which is complete bullshit of course.

The fact that this guy was a pedo is a red herring. It's always "combatting drug dealers, terrorists, pedos, etc." that is used to justify eviscerating the Constitution.

As I read it, Yahoo! gave the government a tip that they were in possession of potentially incriminating evidence and the government requested that Yahoo! not delete that evidence before they returned with a warrant. I do not think that is reasonable grounds for the evidence to be thrown out. The article does not suggest that Rosenow attempted to delete his data between the request being submitted and the data being given to the government, but even if he had, it would not be a reasonable expectation for his data to actually be rendered irretrievable at that point, because Yahoo! would be negligent if they did not have backups of his data to protect their services from mechanical failure or ransomware attack.