Good work.
TheQuin explained it very well.

Only campaign owners decide on which ranks to allow and which to not. They  take such decisions from their business perspective. Most of them thinks that advertisement coming out from Jr. member is not much helpful.

However there are some campaigns which do allows but given so many Jr. Members looking out for signature campaign and not much Jr. Member spots in campaign it is hard to get a spot in a campaign unless you are a very good poster.

That's why bounty campaigns are the only place for jr members to use their signature space. Try to make good and high quality posts first, since it will the base to raise your rank.

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Can somebody try to update the table list like fatanut did? only if necessary, seems there are a lot of rows to be updated.

It's been 2-3 weeks since the last updated table and I have nothing to do atm so here is the newly updated list. Added a red asterisk on Yolodice some of their participants are leaving because there's lack of response from the campaign manager. Updated Nexybit with their increased payrates.

https://paste.ee/p/HhUzL

Edit : Added a couple that I missed.

I guess it's because the campaign requires at least some x numbers of merit in able to join the campaign.

It looks like Bitcloak is finished (again).

Actually, yes.

It looks fine the participants listed on the spreadsheet are still wearing the signatures and avatar. You can join their campaign by going to the link provided in the OP. I guess wapinter locked the thread to avoid spam.

Varanida is still on going since they’ll be having a week 6 and payments have been being distributed promptly every week. The thread may be locked but it may be because they’re no longer accepting new participants. There’s no word from the campaign manager but it looks like the current particpants are not having any problems for now.