Why? McCain was a RINO.
And assuming he isnt a RINO, its called greasing both wheels. Whoever wins, you can say you supported the candidate in case you want to try to squeeze something for the winner. As I recall Trump was known for doing this for years. Play both sides of the fence and you'll always be able to align with the winner to claim the spoils.
I think this makes sense from a business standpoint for sure. Help yourself have as much influence as you can to be able to still grow your business. And maybe you'll be able to keep them moderate, however it doesn't really look like he gave a ton. It's not like he donated to a PAC or a SuperPAC to funnel in hundreds of thousands or anything.