If you mean the traditional definition of a hacker (see #1 in the wiki link above) - someone with deep knowledge of tech, who solve problems creatively - or a consummate programmer - then YES, several regulars here could be considered hackers. Mostly of the white-hat variety. I don't know about grey-hats, but there are plenty of grey beards here! Ha ha!
But if you mean it in the typical media definition of a hacker - a criminal who breaks/subverts security to gain unauthorised access to systems and data - AKA crackers, black-hat hackers or script-kiddies/skids. Then, no - not so much! We don't encourage, or condone illegal activity here. We're mostly about fixing problems and answering other Linux related questions.
We get plenty of wannabe skids, with zero Linux experience, who pass through and make one or two posts with questions about Kali Linux, or some other security/pen-testing distro before disappearing forever.
There are a very small number of members here who are into penetration testing/ethical hacking and know their stuff. But they aren't very active and don't post very often. Most will typically only answer questions that are above board and legitimate. There is a very fine line between ethical hacking and black-hat hacking, but as long as you keep things legitimate, it's OK to discuss them here.
So if you're interested in any aspects of Linux, or coding/scripting, security - stick around.
But if you're interested in more malicious topics - writing/distributing malware, hacking websites, stealing information, boasting about successful hacks, or dumping information - I'd strongly suggest looking elsewhere!
Richard Stallman G.N.U was described as a hacker as you say in the old sense of somebody that tweaked or hacked code in his case the kernel and of course bash such as "cat" - that was once of his.
I tweak the "what gets expressed " from src code for a package via a slackbuild for slackbuilds so i don't mind if you call me a would be hacker ; in my avatar i'm wearing a black cap but that was 40+ years ago.
I do browse security stuff but thats because i have a couple of webs and i want to minimize or make hackers give up and try their luck with people who use wordpress and haven't even done anything to "harden" their web.
I guess by "unknown" unknown means they are linked to Anonymous! ha ha
thats really really quite ironic because i saw that https://owasp.org/ is going to Ghana and i talked about one issue being the "wordpress factor" . That is where due to teaching of ICt being virtually none existent in schools Ghana nearly all the web sites (including Ghana president) use W.P .Thats because all thats needed is a good mouse hand ..
I quoted how shocked i was that it took me a few seconds to find the admin login page and get a "user" from a web site you allegedly mentioned or did not mention and that i alluded to .. yes i just put my solicitor hat on ...