Pick any big company, certainly including all the big tech companies, any company with a brand you've heard of, and any government, and I could put together a dozen compelling "reasons" not to do business with them.

You need to decide whether a company offends your values on balance. Both as a customer of Amazon and as a supplier (author/publisher), I've found them better then average to deal with.

How are they as an employer? No personal experience, but better than WalMart and FoxConn, I'm sure.