Not asking for illegal activity stuff, but for pentesting/CTFs/red teaming kind of activities.
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Have a look at the communities in the instance infosec.pub.
Indeed, they also have a Mastodon infosec.exchange
Here’s a couple.
If you’re looking for Mastodon instances maybe something like infosec.exchange or defcon.social is what you looking for.
Good luck finding new places
I’ll check out the mastodon instances. The kbin (or is it Lemmy? Idk) groups look good too! Many thanks :)