I don't think they are using our browser :)
But in my opinion, blocking a browser as such is not the right solution. In this case, it's the user who should be blocked, not the browser.
It's the user's responsibility to behave well, like in life :)
It's also trivial to detect spoofed user agents via fingerprinting. The best defense against scrapers is done in layers, with user-agent name block as the bare minimum.
Banning the root library (even if you could with UA spoofing and whatnot) is right up there with banning Chrome to keep out low-wage scraping centers and their armies of employees. It's not even a little effective also risks significant collateral damage.