Remove non-competes, then there's no need for garden leave.
If an industry insists it needs non-competes, the dept. of labor could issue exceptions with strong penalties (x3 wages (incld. expected bonuses) for the duration of the non/ -compete, etc)
[1] an argument could be made that the more workers are put on garden leave the better it is for the economy, vis a vis less folks doing damage. Overall, I think the whole fintech industry is a waste of STEM talent. Those physics PhDs could be something beneficial instead, like being a magician at three year old birthday parties.
Sounds like a great incentive to quit the job and hang out for the duration of the non-compete. If I can make more money by working than not working, I know what I'm doing.