If you say so, okay, you're wrong. Here's a link from Madsen's that will show you what we're talking about.
http://www.madsens1.com/bnc_pro_chain.htm
In the chart you'll see that there's a lot of options for chain. Different pitches, gauges, cutter type (semi-chisel vs full chisel) cutter grind(full chisel chains can be ground round or square), amount of cutters, etc.
Square ground chain is cool. It's faster cutting than the same chain ground round, but it's much more difficult to sharpen. Basically impossible to do in the field. The grinders that do it are very expensive, and doing it by hand is much more difficult than round grinding. As such, probably upwards of 90% of full chisel chain in use is ground with a round file or done on a grinder that produces a rounded profile.
Learning to make square filed chains is more difficult than regular chain filing, but the benefits can be great. Check out some YouTube videos to see the difference.