I would have thought that 'none of' in this case was used in the adjectival sense and therefore would not influence the verb.
No, "none" is definitely the subject.
The sentence can be reconstructed to illustrate the point.
"I hope none of you are bidding on this" or without the adjectival sense;
"I hope you are bidding on this"
Whether the 'you' is singular or plural will depend on the reader's interpretation or the writer's original intention. In this case Ron has flagged that he meant the plural by using 'are' instead of 'is' .

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