These are not necessarily illegal multiple accounts ~ "Hey Alice, I need you to create a temporary Nile account for a few days". However, they definitely can be. After Alice's job is done, she deletes. Later, "Hey Alice, I need your help again".
The biggest problem with the free temporary accounts is the fact that when they delete, the monuments go immediately to rubble, instead of only losing one level. This can be devastating to the owner to lose an L5 so quickly & nothing to attack back. No L4 left.
not to mention theres no bandits int he monument plot (that you pointed out i think? and others possibly?)
I still believe that the griefing problem can be solved by making PvP cost scarabs. It is the free accounts that introduces the temporary account that causes the exploits, especially the free account that last only a few days (Palace 1 & a Barracks sending one soldier) to uncap the other account or transfer bread/soldiers from one account to another.
But if they have to spend some of there 10 free scarabs on something they will only need in that temp account it wont help anyway...
you'd have to make it so you must pay for the scarabs first.. but then there would be even less monument attacking when they wanted more?
1. A lot of people say that there are too many monument plots anyway.
limited to 2 per nome and it'd make more fighting for it.. and it'd make less need to uncap with temp accounts