It’s a PR issue not a legal one.
Yah. ALl of this makes me think it's crazy for a company like Figma to even try this. If the designs don't steal from well known brand, people will say they suck. If they do steal, they get booed as well. Losing proposition, it seems to me.
Could it be a fear of a software patent relating to the design? Back in the day Apple had one for swipe to unlock that prompted Android to use different patterns.