The reason I joined Bitcointalk over Cryptotalk and Altcoinstalks is because Bitcointalk is one of the oldest and most popular cryptocurrency forums in the world. This forum allows users to discuss various topics related to cryptocurrencies, including Bitcoin and other altcoins. There is a lot of useful information and discussion here, especially for cryptocurrency traders and investors. In other words, it's very complete here, of course there are lots of signature campaigns.

Until now the Bitcointalk forum is still considered the best source of information and discussion about cryptocurrencies. Despite the weaknesses in the forums you mentioned, Bitcointalk is still a good place to gain insight into market trends, technological developments, and issues related to cryptocurrencies.

Yes I have joined Cryptotalk, as you mentioned cryptotalk focus on promoting Yobit exchange market. However, this forum has also received criticism from many members because of several controversial rules and policies, such as access restrictions for several countries.