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If X is no longer twitter, how long till the copyright on the twitter brand expires?
You can't argue anyone would confuse a website called twitter with 'X'.
Maybe Zuckerberg could rebrand threads Twitter.
That would genuinely be funny, I'm all for it
Trademark not copyright. Copyright only applies to entire works like a song text or the code Twitter has produced. For example the song title alone is not copyrighted. A trademark realistically only expires when it gets contested in court.
Is there a law that you must use a trademark to keep it?
There's a similar law where you must at least defend a trademark against misuse to keep hold of it. That was the reasoning behind this music video for Velcro:
So, based on that, maybe they won't lose it just by not using it. But if someone else tried to establish a Twitter product, they may lose the trademark if they don't fight it.
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Piped is a privacy-respecting open-source alternative frontend to YouTube.
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I think there is, but AFAIK they can use it for something very minor and it still counts.