Every other alternative: Epic, Origin, Microsoft's shop, etc... is far far worse. Valve reinvests in core technology and open source development. Privately held companies (such as Valve) will always have hit pieces thrown at them, in the same way famous (but independently minded) celebrities will. Meanwhile publicly traded companies role out the PR campaigns (I recall an article posted here with Bill Gates talking about his dead dad, and so many users here lapped that propaganda fluff piece up).

I support Valve because they offer a great consumer experience and have made (and continue to make) PC gaming (on window, mac, and linux) a better experience. I certainly trust them more than EA or Blizzard in that regard. I vote with my dollar and they will continue to get it, so long as they continue to do good things deserving of my business.