As far as I can tell it is highly unlikely to be banned for using the GO-tcha - I haven't heard of anyone being banned for it so far - since it is recognized by the game as a normal GO Plus.
HOWEVER: This might of course change in the future. Niantic might be working on some ban, that just makes the GO-tcha stop working entirely - who knows.
And more importantly: The GO-tcha (in the cases I've witnessed) does not change the connectivity issues, because, again, it works similarly to the GO Plus.
So if you want to try out the GO-tcha for the benefit of not having to press the button etc. - which admittedly is pretty cool - go for it! But don't expect it to fix your connectivity issues and always keep in mind, that it is not official merchandise, so there always is a possibilty that the official sources will do something about it.