What Software Uses GPL?
Can GPL be used in commercial software?
Use of licensed software Software under the GPL may be run for all purposes, including commercial purposes and even as a tool for creating proprietary software, such as when using GPL-licensed compilers.
GNU General Public License - Wikipedia
Does Linux use GPL?
The Linux Kernel is provided under the terms of the GNU General Public License version 2 only (GPL-2.0), as provided in LICENSES/preferred/GPL-2.0, with an explicit syscall exception described in LICENSES/exceptions/Linux-syscall-note, as described in the COPYING file.
Linux kernel licensing rules
Is Red Hat GPL?
As of today, all new Red Hat-initiated open source projects that opt to use GPLv2 or LGPLv2.
The GPL cooperation commitment and Red Hat projects
GPL License is a free software license that allows software to be modified or redistributed without any restrictions or compulsory payments for the licensed code. the GPL license is used by Developers to ensure that their code does not become proprietary when modified.
GNU General Public License | GPLv3 explained - Snyk