Isn't that just supporting/opposing the candidate by proxy? If a corporation creates a PAC favoring issue X which airs ad/buys social media exposure supporting

Isn't that just supporting/opposing the candidate by proxy? If a corporation creates a PAC favoring issue X which airs ad/buys social media exposure supporting the candidate who favors issue X, they have in-effect bought airtime for candidate X without any direct contribution to him/her. In this day and age, that kind of exposure is as good as paying the candidate.