You carry costs for the benifit of all users. Do what you have to do to make it a profitable experience so long as the software allows it.
It is different if one is just a normal user without overheads.
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Thanks for your opinion Novacadian. 👍
It would be of interest, to me, what you may think of a decentralized anonymous CAPCHA scheme, which was proposed in a blog post of mine. It could have an added benefit of rewarding non-block producing witness nodes with a small transaction fee for servicing CAPCHA calls. This reward could come from the reward pool or a pool of their own like the new bandwidth replacement.
A link to the post is included below for your reading pleasure.
https://steemit.com/steem/@novacadian/a-decentralized-capcha-annonymous-proof-of-brain-verification