Signature campaign should not consider as a your main earning source. We don't know when a campaign would stop or run and only very limited peoples involved with signature campaign especially btc campaign. I believe most of forum users are not aware about blogging like me. I am not familiar with it and just first time heard its possible earning btc by writing blogs. I know only there is few campaign for blogs but it won't a huge amount like you mentioned on OP. I think most of forum users connected with gambling & trading although both are high risky but quite easy.
My gut feeling to how people would earn money from blogging is that they first grow their audience and then sign up with an ad network like AdSense, which would require that the website in question has somewhere around 5000 interested unique viewers per month. And to get that much viewership, you need to
actually be knowledgeable in some profession or skill, not some ordinary person churning out things that you would see in social media posts.
AdSense pays to a bank account in dollars. There are BTC ad networks in the wild but I suspect professional bloggers would make less money using them because of the shady nature of the ads being ran there. MellowAds alone is largely just gambling/investing ads so if your viewers are not interested in gambling or investing then you don't have much of a choice for ad networks. The reason being is that hardly any normal service advertises itself on BTC ad networks due to uninterested viewers so this becomes a chicken-and-egg problem. A professional blogger with nothing to do with investing would never use a BTC ad network if the only ads his viewers would see (who in turn are not investors) are investment ads.
Trading is definitely not an easy thing to do but unfortunately it's being hyped everywhere as a quick way to earn big profits. When most newbies see claims like that they don't have ears for anything else and they try to guess when the daily highs and lows will be which ends up wrecking their balance. I believe part of the responsibility for loss of money like this lies with the people who promote such a method.
To become a
proper trader or stock broker as opposed to some script-kiddy wannabe trader, you need to have a business administration, economics or financial university degree, complete an internship, find a sponsor so you can take a licensing exam
and pass the licensing exam. How many "cryptocurrency traders" can complete all of that?