Inded. But... Let's say by compiling for Windows and MacOS you are making it work on 80% of users' computers. Then you compile on an older Ubuntu version which will work on any newer Ubuntu or Debian system, and you're at 90%. Worth doing. Then you do a Centos/RH build to get to 95%.

This won't work for all Linux users, but that doesn't have to be the bar. Making a few linux builds for the most popular distros is incrementally better than saying it's Windows/Mac only.