Hello,
I loved in a block once where each unit had its own machine, c/w power point linked to their own meter. They even had lockable GPO’s so the machine next to it couldn’t be plugged into someone else’s power. Most residents would probably prefer it than having to collect enough change to wash their clothes. As long as ample notice was given (so they can obtain their own machine) and everyone is on board then wouldn’t be a problem. What do the By-laws say? Maybe have them updated with a clause that machine are to be provided and maintained by residents.