I have an MX master 2, and I use a G703 Lightspeed with a power play mat.
It's incredible to me that their dongles don't come in USB-C by default, I'm pretty sure that they don't offer either a Lightspeed or unifying dongle in USB-C, which is even more baffling.
I haven't looked at the product lines in a while, but even when I did, it was obvious USB-C was the way to go, and nothing was offered.
I also have a couple of their webcams, and they're all USB-A as well. Just wild.