Good lord. So glad my country has strict animal welfare standards for livestock. Uncomfortable that we still import and slaughter pigs from countries without those standards. (And yes, we import-and-slaughter because we don’t import pork itself. We do however, allow the import/export of live animals, so international trade buys our sheep for ‘breeding’, and sell us their pigs for ‘NZ-made pork’. I suppose it at least enforces abattoir health standards…?)
If anything they’re the opposite. The petitions themselves are not binding, and if they’re not directly to institutions then they’re probably not even noticed.
…but they do convince signers that they’ve ‘done something’, the catharsis of which makes them less likely to do something that actually matters.