You're right in theory, but in practice the point is that email survives because it's not a closed, proprietary protocol.
Unfortunately I don't think the issue is quite so simple. We used to have open chat protocols that were slowly strangled by big tech until only their solutions remained.
I think the biggest problem is simply user apathy, if users cared more we wouldn't have the whole US green/blue bubble problem
Traditionally, we the players paid for the servers. If it was a server browser game like counter strike, the various clans would pay for their own servers.
Companies that sold gaming servers would also host some as an advertisement of how good their servers were
You're right! There's nothing wrong with efficiency and teaching people to be less wasteful, however I believe including it in your argument for renewables means muddying the message.
Talking about getting production to 100% renewable puts the onus on governments and power companies to change.
Talking about efficiency is about getting consumers to use less, and allows energy producers and politicians to point the finger at people leaving their lights on unnecessarily rather than getting on with the job of making more renewable energy.
So you never sign into your account on the desktop (browser - I don't believe any banks have window/macos applications)?