mold growth in dishwasher in rental unit; safety?

hey there, our dishwasher in our apartment has been smelling really bad the last couple weeks so i went to deep clean it. i cleaned it 2 months ago (about 2 months moving in), and i regularly wipe down the inside and run monthly cleaning cycles with citric acid or vinegar.

this is what i found when i went through the pain of taking this ancient machine apart. the mold is everywhere (spray arm, mesh water thing, rinse aid compartment), and i can’t even fully clean every part of it bc i physically can’t get in. i’d shop vac it out at the bottom if i had one.

so, i’m gonna call maintenance, but i want to ask you all: 1) is it safe to continue using at all after they do whatever they’ll do, 2) is there anything specific we should ask them to do for it? they’re responsive but not very throughout.

also why did this happen??

TIA for the help!!