Those were all ~250GB devices, however. Endurance increases with higher capcity.
If a 250GB 840 EVO can get to 800TB without errors, then I'd expect a 500GB 850 EVO to reach 1 PB, easily.
A 500GB 850 EVO has newer-generation, more durable NAND endurance and twice the capacity to work with.
Most of the SSD failed before a petabyte... and started encountering lots of errors before that (forget about the Samsung Pro series which is the only one that survived till its multi-petabyte end).