It’s 2020. Cursor visibility shouldn’t be this difficult for any company to deal with. Yolomouse knows how to tackle this: Give players skinnable cursors, or at the very least, a decent variety of built in options.
In Path of Exile, where cursor visibility is just as much of a problem as it is in D3 due to spell and ability visual overload (especially during something like one of their Blight encounters). Many streamers use Yolomouse to counter that. Quite a few chose the neon green cursor because it’s damn near impossible to lose sight of it as relatively few abilities are that color compared to other colors. The reason even the “giant arrow” gets lost in D3 and PoE is due to the fact that the developers designed it to blend in, or essentially not conflict with the visuals around it. That was a mistake as people can’t see the cursor easily because of that sometimes, even in solo games.
You could always try Yolomouse with D3, since all you’re doing is making the cursor more visible, but as with any third party software, your mileage may vary and no guarantees Warden doesn’t get triggered by it (basically, it’s a gamble, and while I’ve not heard of anyone being banned for using it, it isn’t supported and technically isn’t allowed in the EULA/ToU).