The problem with this is that in the case of Google/FB/etc the database to be copied is so large as to make this task functionally impossible. Even if you happ

The problem with this is that in the case of Google/FB/etc the database to be copied is so large as to make this task functionally impossible. Even if you happened to have a half a petabyte of storage available somewhere you would lack the bandwidth to exfiltrate. The problem with Parler is that it was living on a shared cloud so it was easy for someone to spin up copies and use intra-DC copy mechanisms (or even simple volume mirroring) and the data was also small enough to be within reach for anyone who was curious -- it would cost you less than $5K to copy and then export the entire Parler corpus in less than an afternoon.