That’s a gross assumption that people care about any of this.
For any form of federated community to be sustainable, its users have to care about that. Otherwise those communities will eventually be consumed by whichever instance gains the critical mass to close itself off and become another Twitter or Reddit.
To achieve the benefits of federation, users must be educated on principles of federation, not be obfuscated from them. The question is how the Fediverse can do that.
Power costs vary a lot around the world, depending on where OP lives every little saving can help.