Some devices likely won’t be suitable for computation. Maybe they are too slow, or maybe they need to conserve battery charge. So I think it would be good to have the option of just attaching a fee.
This relates to this post by mav about how to structure a queue of requests & events that occur on the network. In the early days of Bitcoin fees weren’t needed as the blocks weren’t full and block rewards were high. We hope for greater scalability in SAFE, but there should be some similar mechanism in place to handle situations where the network becomes too burdened, even if the network doesn’t end up reaching that level of workload.
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