Because lobbying is a generic word and banning lobbying makes just as much sense as banning talking.
MADD [1] is a lobby group but they don’t have influence by donating billions of dollars.
Its makes much more sense to just reverse the changes in lobby rules (Citizens United) than to “ban” lobbying.
[1]: https://en.wikipedia.org/wiki/Mothers_Against_Drunk_Driving
No, they're an advocacy group, and people like you are useful idiots giving lobbyists an excuse every single time. "Oh but look, if you ban us, you also ban the 'don't kill puppies' group! Wouldn't that be terrible?"
MADD does not pay politicians. MADD does not bring politicians gifts. MADD does not invite them to an expensive restaurant for three hours of one on one. MADD does not do any of the things a lobbyist does that is, for all intents and purposes, corruption.
So you know what ? Yeah, let's silence the don't kill puppies group, if it means that the leeches at the european commission also don't get their ways. "oh but then it will be done secretly" good that means it's officially corruption and we can jail everyone involved.