License is illegal

[carbon-starlight]

1. The name GNU GENERAL PUBLIC LICENSE v3 as Markdown 1 title in all caps and regular text notification that it is modified is extremely confusing for people who do not read beyond the title.
2. Literally right under your notification it is written: Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed.

Wikipedia elaborates:

The text of the GPL is not itself under the GPL. The license's copyright disallows modification of the license. Copying and distributing the license is allowed since the GPL requires recipients to get "a copy of this License along with the Program".[62] According to the GPL FAQ, anyone can make a new license using a modified version of the GPL as long as they use a different name for the license, do not mention "GNU", and remove the preamble, though the preamble can be used in a modified license if permission to use it is obtained from the Free Software Foundation (FSF).[63]

Read the full terms here: https://www.gnu.org/licenses/gpl-faq.en.html#ModifyGPL

3. And for the love of god, please, stop calling your product "open-source". Use "source-available", "source-first" or whatever other term for weirdly-licensed proprietary stuff to avoid confusing people.