I use this mod
https://vborg.vbsupport.ru/showthrea...istration+bots ,this with recaptcha mean I see at most 1 spammer manually registering in maybe 2 months.
The bots have been trying to enter my forum on mass for the last 6 weeks, up to 900 (yes 900) registration attempts per day and they all fail. I am seeing 30+ continous connections every few minutes ,each group of IP's try memberlist,usercp,register,index..... over and over then the IP's change and it starts again. PaulM's Track the guests mod is a useful tool for watching this garbage.