As a corporate decision-maker quite high in the hierarchy, I am very well aware of the fact that if I say something stupid in public, I may end up in jail. The details depend on jurisdiction, but there is a lot of regulation (e.g., EU Market Abuse Directive) which sets quite strict restrictions on what listed companies can, cannot, must and must not say. Companies do not enjoy the same freedom of speech as individuals, nor should they. They still need to be able to communicate their views. (For example, I do not like the fact that if I travel to Russia, I may find myself on a non-recreational camp in Siberia for 15 years, as I was part of a team making a decision to retreat from Russia and openly communicate the political motivation behind the decision.)
Lobbying, on the other hand, is a different story. All democratic countries have rules and regulations on lobbying; lobbyists may need to be registered, they may meet legislators or civil servants only during office hours, no business gifts allowed, meeting time may be limited, etc. In some countries (the US included), offering a cup of coffee (no milk or sugar) is not allowed. Lobbyists must keep to the truth, and all information given by lobbyists must be accurate (but they are not required to give a completely balanced view).
Prohibiting lobbying would be a very bad idea. Lobbyists are important information sources for politicians and civil servants. They do not necessarily give the complete picture, but they can give important pieces to the puzzle.
I do agree that lobbying needs to be as transparent as possible. I also think political funding is somthing that needs to be completely transparent. Banning all external funding is, however, not as straightforward as it looks. If there are no funds for campaigning, social media becomes the primary medium. And the social media is — drumroll — controlled by non-neutral entities.
Of course, this circus about Apple Relay is complete excreta taurii. However, it is not only business-related, there are also some government agencies trying to have a wide access to the Internet data. So, this is a bad example of corporate lobbying.