Corporations and businesses can’t vote, so they shouldn’t be able to donate or lobby. Let the employees, owners, and shareholders donate out of their own pockets instead.
Good Unite Us says those numbers are based on donations of the organization or senior employees. I don't know what they consider senior employees, but OpenSecrets has a full breakdown of what individuals affiliated with Costco donated and to whom. Democrats get way higher average contributions, so I'm assuming a lot of that is coming from people higher on the org chart who can afford to donate that much to a campaign. A lot of people donated smaller amounts to Trump, though.
good or bad, this is the system we live in. you can choose to vote with your wallet knowing that your dollars are less likely to be put towards policies you disagree with.