The problem being discussed is not so much the government stealing people's money, it is the government searching your property without any semblance of a warrant or any shred of evidence that could be used to obtain a warrant.

Per this ruling, if the FBI obtained a warrant to confiscate Google's servers using proof that Google is engaging in criminal behavior, they could then claim to start an inventory of every Gmail account in order to give people back access to their accounts. If they do so, they would then be perfectly justified in starting investigations into each and every Gmail user for anything they find in their emails, without any warrant whatsoever, because their inventory of the emails and pictures was not solely motivated by fishing for evidence.

Similarly, they could seize a post office and do the same with un-opened mail, per the same logic.