It's more like: why can't I send an agent to get what I need from the warehouse instead of going myself?
I should be able to create my own user agent for a website if I want. I should be able to replace their web application and non-free javascript with my own software.
I mean they're a gussied up advertiser, of course if you mess with their "engagement" or bottom line they'll ban you. It's like the "rubber hose crypto breaker" XKCD.
If they ban me, they'd probably be doing me a favor. Actually sending people legal bullshit over this? This is some sort of legally-sanctioned bullying.
I should be able to create my own user agent for a website if I want. I should be able to replace their web application and non-free javascript with my own software.