Getting patents.
And TBH I think the obsession with a burger replacement is some American thing, here they are used for replacing meat (mostly minced meat) in all kinds of foods. I'm not sure I've even tried a fake-meat burger yet.
All anecdotal, though.
As near as I can tell (not chemist), they're focusing their patents on (a) extractive methods (e.g. how to produce raw starting blocks from actual, grown plants) & (b) specific mixes or treatments that target the meat-analog market.
For example, a lot of their parents are of the form of "a food product with X% this, Y% that, Z% the other. Where X had a molecular weight of A and a gel point of B degrees. Where Y has..."