I feel that the CAD/CAM industry has long needed a simple 3 axis product with a 4th as an add on. Small shops and home gamers would flock to this, as they did with F360. Only one that won't bone it's customers...
Small shops and home gamers are a shitty market segment to be in. They don't want to spend much money, but there are not enough of them to support the massive scale of sales needed to keep the sort of development team a CAD and/or CAM platform needs to survive.
15 yeas ago, HSM Works burst onto the market with intuitive, powerful, CAM that ran inside the most popular CAD system... at about 1/2 the cost of legacy options like MasterCAM or NX. They even gave away the 2.5 Axis version! Can't get much more accessible than free.
By all accounts, it was still the HSM Works founders who initiated the talks with Autodesk about a sell-out. Despite being the most successful new entrant in this field in the last 15 years (excepting Fusion 360), even these guys couldn't make low-ish cost software work as a perpetual license business.