A rust rewrite of these tools has a lot of potential commercial value, and I can totally see a cloud provider like AWS putting this into some "hardened cloud AI distro" or whatever. They'll be able to do exactly what they did to Elastic Search, or do the EEE thing and add bugfixes/features that they don't contribute back in order to make their offering more competitive, make minor changes to the CLI as a lock-in strategy, etc.
Not licensing this as GPL will inevitably lead to the erosion of freedoms for everyone.