How is a "super PAC" better or more effective for Zuckerberg than personally lobbying Trump, which might entail transferring some cryptocurrency to a Trump wall

How is a "super PAC" better or more effective for Zuckerberg than personally lobbying Trump, which might entail transferring some cryptocurrency to a Trump wallet somewhere. Given the Trump admin's willingness to ignore laws binding Trump, why bother coloring between the lines at all?