No, on popular distros they are preinstalled, or only require you to check a checkbox in system settings.

I moved from Fusion360 to FreeCAD. It definitely has a learning curve. But I took a few weeks to properly learn it, and I can now do all I did in Fusion. It’s not as polished (although getting there with recent versions) and not as powerful for some applications. But it’s free, open source, and I can laugh at Autodesk and their subscription fees.