Some do. My last full time role had some $100/month stipend for personal supplies. Pretty much paid for my internet bill in that time.
Another before that had some 3000 dollar a year stipend for approved office supplies over the pandemic; basically anything that wasn't groceries could be put on there. I even fancied putting a PS5 on there at once point, but then realize high quality office chairs and desks would drain that stipend quickly.
Most of which you would have anyway. I never cared about incremental costs for internet, electricity, etc. if any. I could have probably collected double-digit dollars per month during COVID but I wasn't even officially remote anyway.
The standard residential plan I had was fine for any work purposes. As far as I'm concerned, incremental needs for normal work are in the noise. I did have outages now and then but they were pretty much for reasons that would have applied to any business service as lines were down.
The stipend is flexible. Some of my coworkers stocked their home office with snacks, for example.