@amiloradovsky@functional.cafe trademark is based on the same fundamental concept of intellectual property, that is if someone uses the same or similar "mark" even without an intention to confuse anyone, they are in violation of trademark. It's like if someone younger than you having a similar name to yours immediately made them guilty of impersonation and on the defensive, without you having to prove/demonstrate their intent first. There are some protections in place, but they don't always work in practise (like fair use). It's not a substitute for copyright or patents, but the overreaching aspect is similar. Like when you just happen to come up with the same idea, you are still in violation of the patent.

I don't know anything about tobacco industry.

I'm itching for you to address my argument instead of just stating the opposite. Copyleft requires to share copies or derivative works on same conditions, how will this be enforced/encouraged without copyright law? What would be the substitute? To clarify, for digital media this means that you are not allowed to distribute it on devices(platforms? mediums?) that might in one way or the other prevent exact copies from being made. For programs this means you must share the source, cause the license is applied to the source. Copyleft uses the exact same mechanisms as copyright, except it turns it upside down and inside out, with the intention to create a level playing field where this alternative culture can compete fairly with the status quo, and form its own industries, as it has been repeatedly proven that this culture is superior for progress, at least in technical fields. This is clear even to current monopolist in those fields, whose last line of defense had become permissively licensed projects (under the false pretext of more freedom), proprietary forks of which they use to stay competitive, and they don't need copyright law for that. Nvidia's proprietary toolchain and drivers, apple's proprietary toolchain and platforms, google's proprietary platforms, all the proprietary firmware, SaaS etc. are not going to go away with copyright. They'll just be called closed instead of proprietary I guess. It wouldn't be up to them to come up with new laws, it would be up to you to organize yearly worldwide "IT break and entry" or "violate yer nondisclosure" events. So much fun!