It's pretty useful when you have some distribution layer (i.e. some pubsub system)
Consider 10-15 applications running on a host, and all of them are listening to data being distributed by another service. Instead of all of them opening a connection to that service, instead they would all be connected to this sidecar, and the sidecar would merge the distribution of data (and subscriptions) to the pubsub system
Oh yeah, for option A I meant to just stay in Canada until my company hopefully gets profitable and then "transfer" it to the US and move to the US if somehow I can self-sponsor/sponsor through company.