Oleksiy, apt-rdepends -r libssh2-1 lists at least 2556 packages, so enabling OpenSSL would require all GPL-ed reverse-depends to add a clause to their license that allows the package in question to be linked against OpenSSL.
According to GPL usage statistics and amount of subpackages amongst the reverse-depends, it amounts to ~500 upstream projects to change their license. Once it is done, I will definitely change the libssh2 backend. --
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