The moderators do a good job
This is a FREE forum so there is no way some one is going to be watching the screen full time 24/7
That takes 4 people full time + one more for 6 months to cover holidays & sick days.
Thems is a lot of wages to cover & we already have a lot of adds just to cover the administration , registration & hosting costs.
Moderators who remove spam and spammers are volunteers .
The big problem is most spammers are from poverty struck countries where the 0.00001¢ they make for successfully implanting spam is the difference between eating & starving .
So the bulk of hem come from Asia & Africa
Asians spam late at night ( USA time ) and Africans spam very early in the morning ( USA Time ) because of their relative time zones.
South American spammers are fine because they happen during USA working hours and are slowly becoming more prevelent .
You can set a forum up to make it harder to post spam but that makes it harder for Joe Public as well and without Joe public posting problems this become a chat room and there are way too many of them already .
If it really urks you then apply to become a moderator .
You can never have enough of them
On the couple I run I only monitor the moderators to make sure they are not becoming subject to their own personal prejudices.
One in particular who has very strong religious beliefs will remove anything that he thinks could possibly be considered derogatory to his particular faith .
And we have a lot of members right around the globe so the mean time for spam to be on the forum is under 1/2 hour.
While we like to think that spammers are highly skilled highly paid professionals in reality the bulk of them are in abject poverty, often with a serious problem , like a blown off leg , that prevents them doing manual labour so they sit in front of old computers reading forum posts & working out how to post the spam that the billionairs who pay them get paid to implant .