Can I Use GPL License?
The GPL is a free software license, and therefore it permits people to use and even redistribute the software without being required to pay anyone a fee for doing so. You can charge people a fee to get a copy from you. You can't require people to pay you when they get a copy from someone else.
Can GPL license be used commercially?
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
Can I include GPL code in my project?
No, you cannot. By including GPL-code, you are including a dependency of GPL-protected code, and therefore your code is only derived work from it. The terms of GPL requires that derived work is also published under GPL.
If I include some GPL code in my project, can I release it as BSD?
Can I use GPL software on my website?
You are free to run a GPL-licensed program without having to accept the license. If the GPL'ed program is client-side JavaScript, then you are distributing the GPL'ed code and possibly derivative code to your visitors. You are only allowed to do this in accordance with the GPL.
website - Can I use a GPL component in my site without having to disclose ...
GPL is enforceable as it's essentially a copyright license. The copyright holders of the GPL software can choose to enforce the GPL on the distributed or derivative works of the software. For example, the FSF holds the copyrights on many pieces of the GNU system, such as the GNU Compiler Collection.
GPL License - Top 10 Questions Answered - Mend