If you wanted to display the massive point cloud with LOD, you can use Potree, which is great for just the point cloud data.
I just saw this on the Sketchfab website, which I hadn’t seen before: https://blog.sketchfab.com/introducing-massive-by-sketchfab-alpha/
If you have some coding skills, this might be an option: https://www.microsoft.com/developerblog/2015/09/10/visualize-large-3d-captures-using-pyrite3d/