I used to have a question - "What's the second word in LandCruiser". It was amazing how many people did not get past that..... I did not think it would work but was amusing.
It would seem the last drips and drabs of spam are coming from real people pushing their own goods. Not had any in a while now which has made it through.
After blocking the main countries - China, Russia and a few smaller ones, it seems to have stopped. Which is nice.
The last ones sneaking through are from USA, Sweden, Germany etc which are actually VPNs so no option there really.