Why shouldnt they? in other games having multiple acc is legit too, you can have many account for one game.
have many acc for one assoc is also legit, if the problem because they can support each other, well you should add more TE friends, its easy just go to FB and join some TE Group, add them, you cant blame them, they have free time and data so...

if mutant is the problem, then you can blame on nordeus lol.

they can set minimum lowest skill to 1, you cant go below 1, cant go minus, with that they can solve two problem with one shot
but they not brave enough, they afraid losing income from ads... maybe