I can’t use them because I can’t convince anybody to switch with me. I talk to most people on discord and I’d rather move to using Matrix, but I can’t convince any of my friends or family or anyone I know to use anything else.
You left out two important real world aspects from your thought experiment.
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one person cares about a specific aspect of the messenger - privacy - and the other doesn’t care, they are just on whatever their peers told them to be on. So if their messenger happens to have the aspect I care about I’ll do it. Since they don’t have any such criteria I expect them to do it as well.
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If that person is important enough for me and doesn’t budge I’ll call or E-Mail them. Which is less private than an e2ee messenger, but more private than data harvesting companies.
