.tor was just an example for this blog post.
We have not actually decided what to do about the tld, but we probably gonna go with .onion . So, like .tor.onion, or .bit.onion, etc. Exactly for the reason that ICANN has standarized .onion and we should keep ourselves in that zone (see other comments on this topic).
We are hoping that the CAB forum will allow onion addresses to get DV certificates as well. I think there are some discussions underway right now, but I imagine the next gen onion services will put extra pressure here.
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