One can claim a trademark without registering it (the difference between ™ and ®). But, if one wanted to sue, you'd probably register it first. But, a claimed trademark that is suitably unique for your product is defensible if you can prove consistent usage pre-dating the new user of that mark.

I'd be pissed if someone took one of my open source projects, forked it, and also stole the name (and put "Open" in front, despite the fact that the thing they forked is Open Source), misleading users and diluting the brand with software I have no control over.

I don't even know what Warp is, but I'm mad as hell about it. As an Open Source developer of 30 years, I expect people to operate with something like honor and decency and respect for other people. Taking someone's open project and launching a competing fork with the same name is hugely disrespectful and dishonorable behavior.

https://uspto.report/TM/90342558

> WARP® trademark registration is intended to cover the categories of [...] Downloadable computer terminal emulator program [...]

Here are some links to the official website of the actual United States Patent and Trademark Office, commonly and distinctly abbreviated "USPTO", whose domain name is duly registered at uspto.gov

https://tmsearch.uspto.gov/search/search-results/90342560

https://tmsearch.uspto.gov/search/search-results/90342558

https://tmsearch.uspto.gov/search/search-results/88455403

Search for "wordmark" "warp", filter for currently live and 009, shows 44 results.

A search for "openwarp" yields 0 results, none dead, none historical; nowhere in the system is this unique name registered.

A banner at top-of-page offers various pointers for consumers on how to discern official US Gov websites from imposters, domain squatters, and name-stealers

Mixing etiquette and copyright.

It is not only rude but also misleading and frankly, stupid.