The Canadian Tariffs are targeted at certain goods that Canada knows it can ramp up production internally, or source from Europe/Asia. they are not broad tariffs on everything. It will cost some some, but there has been alot of thought to maximize pressure on American business while minimizing pressure on Canadian consumer.

I hear you there, Steams multiplayer infrastructure is top notch, I’ve seen a few games get significantly clunkier when they added cross play and moved away from Steam’s services.
Steams also the leader in getting games to run on Linux, although between the heroic launcher or running the offline installers through Lutris, GoG isn’t that bad anymore.

I was questioning that myself.
So far digital goods haven’t been the subject of tariffs on either side.
It would also be hard to tariff successfully as it wouldn’t be difficult for Steam to setup something in another country’s Data center as "Steam International " to bypass any Tariffs.
Although this trade wars has prompted me to start buying games on GoG when that is an option.