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.

[hiddify-com]

The license is based Additional Permissions and Restrictions Under GNU GPL Version 3 Section 7

So there should not be an issue for that

[carbon-starlight]

The license is based Additional Permissions and Restrictions Under GNU GPL Version 3 Section 7

So there should not be an issue for that

@hiddify-com So, do you believe section 7 allows for absolutely any restriction to be made? Even to essentially make the app proprietary? “We disallow for any use of the app except if you sell your soul to Bill Gates under the blood moon”? What would be the sense of copyleft then?

Section 7 allows for a very limited set of exceptions to be made. They should regard to trademarks or warranties. It does not allow for your app to be made proprietary.

Terms

Notwithstanding any other provision of this License, for material you add to a covered work, you may (if authorized by the copyright holders of that material) supplement the terms of this License with terms:

a) Disclaiming warranty or limiting liability differently from the terms of sections 15 and 16 of this License; or
b) Requiring preservation of specified reasonable legal notices or author attributions in that material or in the Appropriate Legal Notices displayed by works containing it; or
c) Prohibiting misrepresentation of the origin of that material, or requiring that modified versions of such material be marked in reasonable ways as different from the original version; or
d) Limiting the use for publicity purposes of names of licensors or authors of the material; or
e) Declining to grant rights under trademark law for use of some trade names, trademarks, or service marks; or
f) Requiring indemnification of licensors and authors of that material by anyone who conveys the material (or modified versions of it) with contractual assumptions of liability to the recipient, for any liability that these contractual assumptions directly impose on those licensors and authors.

All other non-permissive additional terms are considered “further restrictions” within the meaning of section 10. If the Program as you received it, or any part of it, contains a notice stating that it is governed by this License along with a term that is a further restriction, you may remove that term. If a license document contains a further restriction but permits relicensing or conveying under this License, you may add to a covered work material governed by the terms of that license document, provided that the further restriction does not survive such relicensing or conveying.

Read the issue about this under the main app, a good discussion is unfolding there.