>>alexkr+(OP)
If they're ignoring GDPR because they're in the US, you can potentially flag these as COPPA violations. COPPA is
serious stuff. Courts can fine over $50k for each violation, where each individual impacted can be considered a unique violation. COPPA applies to under 13s, I'm not sure if there are age restrictions in place to join Hack Club, but if there isn't even a privacy policy, I doubt age restrictions are properly enforced.