The ToS explicitly forbid usage of third-party clients and people have been banned over this issue. Some people may be fine with taking this risk, but I also absolutely understand not wanting to deal with it. Personally, I fall in the latter category, so I mostly have the web client open in a pinned tab.
Oh fair enough, I didn't know. (As you can see from my listing, I'm using the official one. But just because 'meh, whatever, it's ok, I don't care' rather than because I didn't like the others or knew about the terms prohibiting it.)