This is a good question. There’s is no reason why this -and a lot of other things imho- must be connected.

Amazon is donating $1 million to Trump’s inauguration

Bezos and the company decided on the contribution earlier this week, and communicated it to Trump’s team, according to some of the people. “Bezos is donating through Amazon,” according to a person close to Bezos. Amazon also will stream the inauguration through its Prime Video business, a separate, in-kind donation valued at $1 million, another of the people said.

Seems to be sort of a flat rate.