Is mega voxels free?

I'm curious, can you clarify for me if mega voxels are offered as a free service? It's important to understand the cost structure associated with this platform or product before making any decisions. Are there any upfront fees or ongoing charges that users need to be aware of? Additionally, are there any potential limitations or restrictions that come with a free account? Clarifying these points would greatly assist in evaluating the overall value of mega voxels.