I think free access to use the patented tech is only a part of the answer to building such a mechanism, and definitely a good first step. Looks to me like the build quality would make an even larger difference to the success of the device. For example:

> The fuse wire is designed to be stable enough to resist stretching or thinning over time despite the intense repeated vibrations from the saw use, ensuring it doesn’t prematurely release the spring.

"Just" some bad QA and the wire releasing the mechanism breaks too early needlessly destroying the saw, or too late needlessly destroying the hand. A patent won't fix that for the manufacturer.