Most of the campaign are accepting Jr. Member in their group, if you saw campaign accepting newbie then there is 90%possibility it's a scam.
Well, i think you need to be specific which campaign accept newbie is mostly scam?
If you talk about signature campaign, yes it might be true but its not the best reference.
If social media then you are wrong. I had joined many project im social media from newbie and many of them is legit and good project. So participants is nothing if we want to talk about scam or not but developer is the key of this.
Don't pay attention too much on the color.
If you dont pay attention with the colour and you might be loss all of your work.
I had experience about. I have disqualified from the campaign and in spreadsheet i have coluor but i dont pay attention, at the end, i did not get stake and payment. Manager said that i was disqualified.
It means, you have to pay attention with everything small if you want to get paid.