RE:Electric Air Taxi marketMost of these wont survive as making the technology work is one thing, another are the regulations/approval to operate them commercially. Compare home buit/kit plane cost to certified cost of aircraft and you will see the difference. You need certified aircraft to operate commercially.
Alot of these guys have pretty PowerPoint presentation and cool concept drawings with no major financial backing.
All major helicopter OEMs have provided seed money to select few who have potential. Once they mature then expect the majors to buy the company out. This is not the space/market for Bombardier