So, I do feel for SOME people who legitimately have office expenses that the office should pay for. Not talking about one time monitor, mouse, crap but monthly office supplies. Those do add up.
Having said that, there are ways around it. Starting a business and getting a tax break for those expenses helps, obviously not something doable for monthly office supplies and groceries, but if you NEED a monitor etc, well. Tax write off here we come. And yes, there are some * on that, such as you ALSO need to use it for "work" at you new business, but I have found that is easy to make happen. And to be honest, given current tax laws in my opinion, working from home or not, EVERYONE should have a business, but I understand that it probably a bit much for the average Joe/Jane.
Also, to give to the point of the employees are still saving money. Yes/No. If even half of these people live in a place where they have to pay for laundry and some of the other more reasonable "freebies", yea it adds up. The freebies, might (and a big might) be more or less what is saved on the commute pending various alternative options that are chosen. Obviously ordering Chipotle every night isn't going to save you jack and I would have zero surprises if this was the case for some of these people.
A lawsuit, probably overboard, BUT there are some legit issues that companies should be aware of and given how the world works in the USA..... A lawsuit might sometimes be the only way... even if some of the grievances are not legit.