The recommendation to use an AMD GPU still stands, since it's passed into the VM. I've been using an RX 560D on Catalina (the one that didn't advertise having 2 fewer CUs, grrrr) without any graphical trouble.
iCloud mostly works, the only two apps that I can't get working are iMessage and FaceTime. This is a common issue for all Hackintoshs, it's not a VM specific problem. It comes down to needing to provide a real Apple SN that matches the kind of Mac you set your Hackintosh to identify as. I'd half recommend picking up a broken / for-parts iMac off eBay to lift the serial number off of (and to say you do actually own a Mac =P ).
I did have some trouble doing passthrough of NVMe drives in the past. I don't know if this was the VM's fault or the fact that it would get hooked by Linux on the host boot and then be unbound before booting the VM. I haven't tried again in the last 18 months, so it's entirely possible any issue there got fixed. I've been booting from an iSCSI volume from my NAS (QEMU hides this fact from macOS).
I should add that I moved away from the Apple ecosystem awhile ago in terms of my personal data. I use a mix of Google services and NextCloud (hosted on my own hardware). My Apple ID getting banned isn't too much of a concern for me. I've never heard of someone actually getting their Apple ID blocked for using a Hackintosh, I figure there are so few people actually doing it it's not worth it to Apple to enforce.
That being said, I don't know how they'd respond to a wealthy company using a bunch of Hackintoshs. I still don't understand how they expect people to properly do CI/CD for iOS without macOS in a server / virtualization environment though. My employer uses rack mount sleds for Mac Minis, but without proper IPMI, managing them is a pain. I wish you could license macOS for a virtualization environment so you could deploy a few 1U dual socket 64 core EPYC servers (128 core / 256 thread total) rather than 4x 6 core boxes per 1U.
Either that, or they should let the toolchain run on more than just Macs. I think that is one of the major features of React Native - you can develop your apps on whatever machine you want. You only need a proper Mac when you're bundling for release.
