No captcha?

Hello,
I am learning programming and just discovered this website. But I am curious, how does it protect its users from spammers (people who post illegal or annoying things) without a reCaptcha? I thought clicking this blue box is required to prove that you are not a robot, can you please share any javascript that you use for this purpose?
Thank you and have a nice day,
Brian

770 buzz=FiveSevenEleven Name: Anonymous 2021-01-20 3:06 nextperm=20210120360
🂱 💚 💗 💚 💖 die +3m #154 fizz=SevenEleven inhour=7 inday=64 prime=887 hofR=13349 💖 💚 💗 💚 🂱
gcd = 154 = 0*770 + 1*154 lcm = 770
fib = 42230279526998466217810220532898
e ~ 1038929163353808 / 382200680031313 = 2.71828182845904523536028747134_9248563371580028939628559933000

Upgraded the gcd processing step >>108 to compute the lcm as well for the 362 >>8 "die" posts. https://dis.tinychan.net/read/prog/1582047203 [parsetime, buttonnum, rmslinks, timedelta, count, rmsimages, fizzbuzz, hourdaily, primes, hofr, hearts, gcdlcm, fibonacci, broccoli, nextperm]

posts code in /prog/