The problem with the infinite is not learning it (its not complex in its structure) but actually managing to execute it and more importantly, being able to hitconfirm into it. While the opportunities to do so do exist, doing it on reaction is very very difficult. Tobari is the only player I've seen consistenly doing it.
Not too sure about the softban, as far as I remember there wasn't one on KohaMech's infinite until they patched it.