Amazon has the warrants now - all that they could get - "vested" is the term used that gives them the ability to "exercise them" in exchange for actual shares, which they could then of course sell
The Amazon (And Walmart) warrants are not like regular warrants as they don't have to pay for the shares they exercise (AFAIK). they were given in lieu of a bulk discount on the business placed. - hence why they are in the revenue calculation
So Amazon now has the right to get 000's of shares that were given to them priced around $11 I cant recall th enumber of shares but it was based on a total that amounted to 10% of the company back in 2018 or when ever the deal was struck. the dilution effect will be far less now IF THEY DECIDE TO EXERCISE since the O/S is much larger