Your example is too vague to make much of, frankly, but in theory I'd believe perhaps it's possible for lobbyists' positions to align with or at least not contradict the public interest, though recent decades have shown precious few examples compared to the sheer volume of fuckery like this. A law could be written to not target all lobbying activity while still being able to draw useful distinctions between doing harm in the name of profit and providing some kind of useful industry insight (whatever that may be) to the process of government