Isn’t that just the point of a salary anyway?
The cost of my clothes (jeans/shirts/ties/etc.) as well as my daily coffee/tea/juice/lunch is for me to pay.
"Extra" stuff that I need to buy is for them to cover. E.g. a headset for calls, e.g. my professional certifications maintenance.
My home's wifi, I pay it for my use. Since I use it for work 8h per day (40h/week), one could argue that the employer should pay 40/168 of the cost (5x8/7x24).
Tbh, if there is the chance that I will be asked to go back to the office for $25 per month, I will gladly continue paying for my own wifi 100% and stay home :)