This is a very strong statement. It means you wouldn't want to work for any of the software or hardware firms that supply them. Eliminate Microsoft, IBM, Oracle, and most networking and big data providers from your list. Eliminate all financial services firms who make either commissions on the other sides of the trades with them, or get better bid-offer spreads as a result.

They're not saints, but it's very hard to remove oneself from where they have impact.