>>13 If Denpa-chan 2.0 should also be an imageboard or textboard or anything similar, I recommend you look into getting a Proof of Work captcha working. KC and 8moe use it for Tor/proxy users and it does wonders. Making a captcha like that yourself is not hard, it's just a a ~50 line Python script that brute-forces an argon2id hash, then you can insert the solution in your browser, and you have a proper spam filter. Even if you don't know programming, it's easy enough that "the denpa-chan community" could make it work. This whole approach brings with it that it filters absolute tech-illiterates who can't be bothered executing a Python script, but maybe that's for the best. In case you don't want to shy away normal people, you can also write an optional Javascript PoW solver.
If Denpa-chan 2.0 should also be an imageboard or textboard or anything similar, I recommend you look into getting a Proof of Work captcha working. KC and 8moe use it for Tor/proxy users and it does wonders. Making a captcha like that yourself is not hard, it's just a a ~50 line Python script that brute-forces an argon2id hash, then you can insert the solution in your browser, and you have a proper spam filter. Even if you don't know programming, it's easy enough that "the denpa-chan community" could make it work. This whole approach brings with it that it filters absolute tech-illiterates who can't be bothered executing a Python script, but maybe that's for the best. In case you don't want to shy away normal people, you can also write an optional Javascript PoW solver.