I've theorized what a solution would look like, though it'd have a different end goal to ignore bots so true discourse could be achieved. The theorized solution would be less communal though - instead, institutions would be "vouchers" and be provided the ability to confirm individuals as a real person. This could be colleges, workplaces, unions, banks, etc. There'd be no "denouncing", only "vouching" the individual as a real person. The individual's identity would never exposed - social media platforms would use a key, such as an e-mail, to verify the individual's existence as a real person, not their identity. Platforms could identify what rules would qualify an individual's recognized "existence", such as what institutions they allow, minimum number of institutions, etc. In theory, the individual "existence" could be built before they ever register for a platform. This could go way beyond social media platforms too - some examples could be vetting job applications, accepting contributors on OSS projects.
This would create a digital fingerprint of a real individual using their unique identifiers (email, phone number, etc) which may be undesirable, but individuals would absolutely have the ability to revoke their unique identifiers from participating in the program if they desire.