This is exactly what Apple did with MLB Baseball and their "Friday Night Baseball". I have not given in to paying for AppleTV+ just got watch 6 Jays games. I have either not watched, listened on the radio or found a stream.
As for Prime, I already pay for the shopping convenience of fast shipping, so this is a bonus for now and I will definitely take advantage. I took a peek at the Pens/Habs game last week and was impressed with the quality even on a 1080p TV vs Sportsnet/TSN apps on my FireTV.
I think we have to get used to this going forward, with streaming services that will be bidding for more sports. Amazon will likely be the 3rd player in the next NHL rights deal as Rogers will for sure step back from their national broadcast righsholder, I'm not sure that it will be an 3 way even split because that would be a shock, but I would expect Amazon to push for more rights for Canada as well as the US.
One thing I would suggest is to try to download the Prime Video app on your smart tv or other streaming device like Chromecast or Roku, as when I tried the other game in a browser window, it was not a 60fps stream, but rather choppy 30fps, at least in FireFox. Could be better in Chrome or other Chrome based browsers but I don't use that.