This thread is literally doing nothing.

Nobody is going to stop using grammarly extensions to post to HN, nobody is going to be able to detect its usage.

This thread just lets a certain kind of people put on their best condescending hall-monitor voice and lecture other people about how they should behave.

And the rule is arguably less useful than speed limits and will be broken about as often (at least speed limits have a very real link to physical safety via kinetic energy).