They have to be careful with those wash and fold places. First, they usually aren't at dry cleaners, they are at regular laundromats which do bulk loads the way the post office handles an overflow of Christmas cards. I suppose there are also at dry cleaners which do it too but they'd be a lot more expensive. Those services may or may not be worth the extra expense of not doing laundry themselves. First: they will not sort out the laundry. If they give them a big bag, a big bag will go in the wash, unsorted. Blacks will wash with whites and even if they see a red sock going in with whites, it's not their job or their care to take it out. I'm not even sure you get to choose the detergent. They also will not sort for delicate cycles or for different drying temperature. It all goes in the hottest setting in those industry dryers so they dry the fastest so they can do the next load. It is a bulk business for them.
I've had all my elastics melt at that high temp. I've also had all my clothes come out dingy colored from being washed together, and things I wanted left out of the dryer or especially dried that hot, shrunken to doll size clothes.
If they want colors sorted, they must sort them themselves into separate bags for separate loads. If they want different wash temp, separate bags. Clothes not dried at all, different bags. You get the idea.
If they decide to go to laundromats themselves, while they can leave the washer unattended, they canNOT leave things in the dryer and leave the laundromat. Nice things end up missing when they are unattended.

OR if there is a line of people for washers and dryers, the loads get rudely & unceremoniously tossed out of the washer or dryer if the owners don't come to take them out in about 5 minutes of the end of cycle and stuffed on top of the washer/dryer or in a laundry basket and someone new puts their load in.
I have a coin laundry in my building. I suppose I paid more for that initially, I'm rent controlled now. I get to stay home, not lug a luggage cart with a laundry bag & detergent perched on top and walk to the nearest laundromat, especially over snowy or rainy sidewalks. I don't have to sit there or walk around the neighborhood during the wash cycle. I can watch a movie, and when my load is done, hit the pause on the DVR, run & toss the loads in the dryer and un-pause the movie and finish it. Some of us actually do leave our clothes in the dryers unattended in our building.

But, I also wash my clothes after hours, when "technically" the laundry room is closed and most people aren't washing theirs. I know a couple other people in the building who do this too. We often bump into each other.
One thing I learned to do to save money is to never just wash ONE load. While we have normal size front loading washers, we have the industrial size laundromat dryers. So I can fit about 2-1/2 size wash loads into the one dryer and dry it all in the one 45 min cycle on medium temp. (While I separate my clothes into colors for washing, I've found drying them together doesn't affect them.) Since I always have an arm load of stuff to hang dry (making up half a load,) it works perfectly to wash 3 loads at once. It costs me $8.50 for the 3 loads & 1 dryer cycle.
You have to realize while doing wash & fold is just ONE extra expense, there will be a dozen or more in a single month that are unknown or unplanned, especially when one is new to the city and all the experimenting they will be doing to get around, live, work and figure things out. It all adds up, a few extra dollars here and a few extra there.
You mentioned they are paying their own electricity. Is their heat included in the rent? Or is that extra? That first bill will shock them, especially if they keep the heat up as they are used to Fl temps. If it's included in the rent, they might not be as toasty warm, if the heat is not on a lot, especially overnight. I think the law is that the building only has to keep the temp at 69 degrees at night. They may want to invest in extra sweaters or blankets or throws to wear around the apartment. Or get an space heater, (and pay the extra electricity.) ALL of that are extra expenses, and again ONE expense of many. If they get extra sweaters, then they have to wash all those extra sweaters, adding an extra a pound or so a wash each week. Do you see how that adds on to the laundry expense now?
BTW, there is talk that the subway fare is going to be raised yet again soon. There are always protests and meeting of course. But, I've
never heard of a time when the Transit Authority has ever said. "You know, because of your protesting, I guess we don't need to raise the fare after all." Expect that extra expense.