I used to own and run cx500forum.com and tw200forum.com, and the spam eventually drove me to sell the sites. It was a constant, unending battle of upgrading software, modifying filters, implementing captcha, and none of it worked for very long. By the end I realized I needed staff, and was ready to just shut the forums down (or just not restore them from backup the next time some russian hacker killed them for fun). Went looking for a company to take over, and then got bought out, and it was the Best Day. I ran the cx500 forum in particular for more than a decade, in various forms on various platforms, and the day I let it all go was my Best Day.
Managing spam is hard, unending, tireless, and unappreciated work. It's why so many small forums become part of giant forum-hosting companies, it's just too difficult for one guy to do anymore, because there are so many bad actors that want to destroy just for the sake of destroying. Such is the world we live in now.
Loud pipes don't save lives, they just piss off voters.