I have to wonder if Taylor agreed to custom-build McDonalds an ice cream machine specifically because they figured they had implied license to hose franchisees on service costs. Or, in other words, if McDonalds had said "make the machine reliable enough to serve ice cream 100% of the time with no service calls", then Taylor would have charged 10x or something. The fact that McDonalds is libeling Kytch sounds like Taylor is speaking through McDonalds' mouth.
Even if McDonalds had been more reserved, however; Kytch still has some industrial-espionage claims that might go somewhere.
Also, for those wondering exactly how controlled McDonalds' franchise relations are: McDonalds franchisees are required to rent their locations from McDonalds, because McDonalds front-runs their business partners and buys the most valuable land[0] from under them. Literally nothing about the business of being a McDonalds franchisee works the way capitalism or business ownership is "supposed" to work[1]. It's more like paying to work at a somewhat-lucrative job than actually owning a business. McDonalds is a richest-of-the-rich company that sells business opportunities to the poorest-of-the-rich crowd[2], who are looking for a way to park lots of wealth[3] in a safe asset.
[0] Typically, land immediately next to US Interstate off-ramps or equivalently high-traffic highways
[1] Unless you're a left-winger, in which case the McDonalds "strip our business partners of capital interest in the store" policy is how capitalism is "supposed" to work, and treating your business partners as equals is a historical aberration.
For the record I do find the left-wing critique of capitalism to be at least somewhat grounded in current business reality.
[2] Menial labors of the capitalist class. If you define "poor, middle-class, and rich" based on how people make their money (poor: unskilled labor, middle-class: skilled labor, rich: capitalism), then you can recursively subdivide that grouping further, with richest-of-the-rich being people whose wealth comes from owning other businesses through some means (usually trademark or copyright).
[3] McDonalds wants their franchisees to hold at least $750,000 of liquid capital and be able to invest between $1,000,000 and $2,200,000 into their stores.