That's Satan not God working through Monsanto. Monsanto is one of many reasons why Jesus is returning, because mankind is unable to stop Monsanto, global warming, fracking, insane pollution in China, and the stupidity of placing a nuclear power plant next to tsunamis on the sea shore or on fault lines. Thank God though for generation 4 nuclear reactors that can withstand anything except a nuclear strike.

Killing the firstborn of Egyptian children was the punishment for enslaving the Hebrews for over 400 years and the Pharaoh still unwilling to release them after 10 plagues. Egyptians were suppose to store up grain and they did not.

By eating the last stores of grain that was tainted left for just the firstborn to eat was God's punishment. Monsanto's reach is global so I don't think that is God's punishment as much as the escalating evil work of Satan. We get God knows what other kinds of problems because of Monsanto, but the common man is unable to stop Monsanto so God will intervene.

God is allowing this evil for good, but I think it is less specific like it was for the firstborn of Egypt. Things are so convoluted now, Satan is taking hold on a global scale so I don't feel it is the same as the firstborn of Egypt. It is just mass killing and corruption on an epic scale, and Satan is winning the day. This is why things lead up to the Tribulation, that is, the last 7 years God has in view before His Son returns.

Jesus returns not for the sake of world in general that rejects Him, but for the sake of the elect.