How will you regulate the possession and distribution of IMUs and electric motors?
Hell most of the parts you need to build a drone are available in a used cellphone and many of the rest can be 3d printed.
Typically, I think, laws against possession of such homemade illegal goods are enforced as add-on charges to other crimes, unless you are selling them.
You're going to run into the same situation with drones. It is easy to imagine some super complicated drone based attack scheme when there are far simpler and more effective methods of taking care of a target involving firearms.
https://www.rollingstone.com/culture/culture-features/arming...
This fella in Texas was selling .50-cals and miniguns straight to the Cartels for years. There are likely many, many more like him.
Mexican think tanks have spent years trying to figure out how the hell to stop the massive flow of weapons into Mexico from Texas and Arizona.
https://www.mexicoevalua.org/mexicoevalua/wp-content/uploads...
US think tanks too, notably David Shirk at USD has done a bunch of work on this.
https://catcher.sandiego.edu/items/peacestudies/way_of_the_g...
Can't stop it at the source anymore.
Everything sounds simple in theory until you think of the consequences.
If you show up at a farm store to buy certain fertilizers in unusual quantities, that interaction will likely be reported or otherwise flagged.
For instance; https://pubs.acs.org/doi/abs/10.1021/cen-v073n022.p006