My last message was deleted somehow.
Oops. I just realized that you just said the same thing about downloading vs. streaming laws.lol.
Best way to pay would be the way you feel safest. As long as your not using IKS you should be fine using your CC. Streaming as far as I can tell is not illegal yet since your not downloading copyrighted content. But you should look at the laws about it in your area.
My last message was deleted somehow
You can use the MAC on multiple devices/clients but you can only watch it on one device at a time. Now you may have issues if you want to use like a mag and kodi or some other EMU because they handle the serial number differently.