These must have been only profitable cause Bitcoin rose significantly in value so the insignificant amounts that were gotten rose and became very significant. If you take out the ridiculous appreciation of bitcoin it would not be useful to those irrespective of country.
If you really want to build this you should go on LinkedIn, search for developers and explain what you want done to them. I am sure you will get one that can create what you are suggesing.
it was I mean the site's fund had at least 12 Bitcoins and the owner closed and toke the money, the man is probably a millionaire now lol.
I am looking for someone who know how to create these type of sites, it really can be profitable especially with the rise of i internet in poor countries (most people who worked in these sites are from poor countries) and of course the rise of social media being profitable for influencers.
CodeCanyon offer a platform that is very similar to AddmeFast one of the scripts that is very popular on CodeCanyon is SMMLab - Social Media Marketing SMM Platform you can go to CodeCanyon to research this script and a similar script, creating a customized script will cost you thousands of dollars and you need a dedicated server and you need a team to do it.
It may be profitable but marketers prefer to hire people from Fiverr because they can deliver results and you can see their rating based on their work.
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I will check these sites thank you very much my friend.