Yeah, although people volunteer to wear the signature, there could be some confusion since in bitcointalk, wearing a project's signature = there must be an ongoing signature campaign.
I doubt that there is anywhere a rule like that. I've never heard about that and don't see any explanation why someone would come up with it. Any link or quote?
I think Idena hasn't had a plan to hold a paid signature, I see that there are still many people who volunteer to use the signature, maybe you can ask about a paid signature on their telegram, in order to get a response from them
As i know idena team was never interested in loud bitcointalk paid marketing especially now ... when sharding is a key feature for network to continue to grow.
I'm ok with it being a part of the community we need to help the community grow, I am continuously looking for as paid signature campaign, but after the campaign I've joined, it sometimes took me a week or two to find another one so while looking I have something to wear that is worth promoting.
Same strategy here.