Different messengers, for different use cases. Personally i, don't like the idea of sharing eveything with unknown to me creators of different messengers. In the current state adamant have some flaws, but it is a prototype, and it will be better and better. I think that my data, must be mine. Governments seek your data, i can accept it, if they weren't in fact peoples with issues like other people have. But more to it, hundreds of companies also seek your data, to sell it, to monetize on it. Messenger creators, search engine trackers, everyone just want to sell you. "If you're not paying for the product, you are the product.".  I'm not telling that messengers you list are bad, they are good, great, i use many of them aside with adamant. Different instruments, for different purposes.

One silly question to consider -  How "Free Messenger" with no "Ads" and no "Store" can be profitable to pay costs of it's infrastructure?