Personally, I have trouble continuing to buy from Bandcamp since they were sold to another company which promptly had a round of layoffs.

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On the other hand, games rely on Gog Galaxy for some features, and Galaxy is not available for all platforms which they sell games for (specifically, Linux).

Having globally routable IPv6 addresses for each device doesn’t prevent you from running firewalls.

Yeah, if you just want to use it personally, you should click Sign In in the menu, then Open Element Web, which brings you to https://app.element.io/.

Alternately Get Started then Download the app.

Either gets you to a client where you can easily create a Matrix account (on matrix.org).

On the tech side of things, the environmental impact of running traditional, centralized services is inherently lower than running any cryptocurrency off of a blockchain. To overcome the technical limitations would be to create another centralized service.

But yeah, there are almost certainly ways that traditional currency can reduce their environmental impact, too.