We don't aim to be a definitive collection of all the world's brands. Rather, we only add brands that are specifically requested or contributed by our community (and, occasionally, on a whim by our maintainers!) and, so far, nobody has requested this one.
If you would like to see the Grindr icon then please do feel free to open an issue or pull request. We would ask, though, that you attempt to contact them to seek permission first as their terms of service state: "The names and logos associated with the Grindr Services are the property of Grindr. No use of these marks is permitted except through the prior written authorization and permission of Grindr. All rights reserved."
It was added by one of our regular contributors to complement the WWE & NJPW icons already in our library.
It's far from the most niche one we have, though. My personal favourite is the Chupa Chups one, which I added on a whim a few years ago after learning it was designed by Salvador Dalí.
Thanks, TRiG; we're working on a fix for this and should have it implemented soon. As the token Irishman on the team, that icon was one of my creations, by the way.
If you would like to see the Grindr icon then please do feel free to open an issue or pull request. We would ask, though, that you attempt to contact them to seek permission first as their terms of service state: "The names and logos associated with the Grindr Services are the property of Grindr. No use of these marks is permitted except through the prior written authorization and permission of Grindr. All rights reserved."