The other difference is that steam is not just a DRM method, it's also services platform that also includes a marketplace, matchmaking service, community features, achievements etc. etc. Most people who actually like Steam that I know like it not because of the DRM, but because of those services. A lot of Valve's commercial success is also down not to DRM but the success of those other services. And they're not likely to step off their competitive edge there.
However not everything is released with Steam only. Look for games to be released elsewhere, I guess.
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There are only forty people in the world and five of them are hamburgers.
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