They can, but they shouldn’t, as I argue in my article. Why not? Main reason: portability.
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Discussion
Ok, I’m not reading all that. As I said, I don’t like that idea of WoT at all and not because of technical reasons. Portability can also be provided via relays. I don't like it either, having to rely on a third party service for that. But whoever enjoys it... it's not my thing. Doesn't fit my idea of sovereignty.