It's not the $2/mo at face value. For me it's the idea of them pushing to make paying for SSL certificates the norm again after Let's Encrypt has put in a huge amount of effort to change that field. Not that there's anything wrong with charging for things but charging for a free service rubs me in a weird way, especially since they're using Let's Encrypt.
Using the rounding error logic, how do you feel about companies adding $1.99 "convenience fees" or "administrative fees"?
One reason is that many people use that as a baseline for how they I'd multi-tenacy. It could be they just proxy resources from their customer down to the infrastructure.