Right now they're not transferable, except through SP delegations. Maybe there won't be an RC market, but only an SP delegation market (many exist already).
dapps are already using custom threads and tags. I suppose there is no good reason a walled garden couldn't just manage SP delegations to their users and withdraw them if they escape the walled garden, even if no RC market is developed.
I still don't know how I feel about Ned commenting agreement on the issue of scale, but without disputing some of the more dystopian aspects to my post.
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