To best of my knowledge no state or local health department has exact law or regulations regarding hotel/motel laundry about wash temperature and so forth.
From North Carolina:
15A NCAC 18A .1828 LAUNDRY AND LINENS
(a) Except as specified in paragraph
(b) of this Rule, clean bed and bath linen in good repair shall be provided for each guest who is provided accommodations and shall be changed between successive guests. Two sheets shall be provided for each bed. The lower sheet shall be folded under both ends of the mattress. The upper sheet shall be folded under the
mattress at the lower end.
(b If bed covers are not cleaned between successive guests, the upper sheet shall be folded under the mattress at the lower
and folded over the bed cover minimum six inches at the top end.
(c) Clean linen and supplies shall be stored in cabinets, or on shelves in linen and supply storage rooms. Cabinets, shelves,
and storage rooms shall be in good repair and kept clean.
(d) Items on housekeeping carts shall be arranged in a manner to prevent cross-contamination between soiled and cleaned
items. Housekeeping carts shall be kept clean and stored to protect items from contamination.
(e) Soiled laundry shall be handled and stored separately from clean laundry using separate cleanable carts or bags. Carts
used for soiled laundry shall be labeled or identified for soiled laundry use only.
https://ehs.ncpublichealth.com/docs...rningTheSanitationOfLodgingEstablishments.pdf
massachusetts says only that hotel/motel linens must be laundered using "detergents and sanitizers", and laundry equipment must be signed off by state DOH.
https://www.mattapoisett.net/sites/...ploads/2021_hotel_and_motel_regulations_0.pdf
And so it goes...
Yes, for restaurants and places that prepare/serve food have seen requirements that dishware and such either be washed in very high temperatures, or chemicals must be used to ensure proper sanitation.
CDC guidelines for healthcare linen...
https://www.flexp.com/cdc-guidelines-laundry-healthcare-facilities/
As this post makes clear federal guidelines (CDC and OSHA mainly) are just that since states via their departments of health have direct control over this matter.
http://blogs.hcpro.com/osha/2009/01/ask-the-expert—healthcare-laundry-guidelines/
As to why some places use "homestyle" or residential domestic washers as opposed to OPL or commercial, it usually comes down to cost.
Even smallest 18-25lb front loading commercial type washer is going to cost dear. This even if place goes with OPL or other soft mount version.
That being said cannot imagine any but small motel or hotel going with such machines. They just aren't built to handle heavy use...