Mailinglists are great, because more and more people do no longer know how to use email or follow the instructions to sign up for a mailinglist, so many interesting people tend to gather around the lists.
Meanwhile there are also plenty of tech folks that have zero empathy or interest in quality that can easily get past any technical barrier you put in front of them, like the more talented folks at companies like Anthropic or Meta.
Making things difficult to set up tech wise doesn't select for intelligence or skill or creativity, it selects for people that work in tech as their day job.