I’ve had the same issue. I’d like to support the artists, but the music is only available as physical media or for streaming on sites I can’t use or don’t want to give money to.
My current plan is to support them by buying unrelated digital merch, such as voice packs. Though if too many people do this it will distort with their metrics, so it’s not a great solution.
On the same note, the target audience is mostly white dudes. It’s a lot easier to sell them the fantasy of playing as / fighting against Thor, Zeus, or Hercules than it is to get them excited about some character they’ve never heard of and can’t even pronounce the name.