Open 0xr.space in the Quest browser or on a computer, press Open and choose the .las, .laz, .xyz, .pts, .asc or .pcd file, then press View in your space on the headset. The points are drawn as small round dots in their own colours, sized to the spacing between them, and you can walk through a room-sized cloud or shrink a site to a tabletop. LAZ is decompressed in the browser.
Limits worth knowing: a LAS or LAZ over 4 million points is thinned on opening, and a Quest draws at most 500,000 points at once, a desktop 2 million. The cloud is moved to its own centre, so survey coordinates are not kept. Intensity is not shown, so a cloud without RGB is white. E57 is not opened; export LAS or LAZ.
No. Convert it to LAS or LAZ, for example with CloudCompare.
It has no RGB colour. Intensity is not turned into shading, so a cloud with only intensity shows every point white.
Not point to point. The cloud keeps its real scale, and one up to 10 m across can be stood in at 1:1, but there is no survey measuring tool.
Not yet. A point cloud stays on the device it was opened on.