For me to consider using it, the company would need to have millions of users, a large team of highly credentialed security engineers working on ensuring it is

For me to consider using it, the company would need to have millions of users, a large team of highly credentialed security engineers working on ensuring it is not vulnerable, and 6-figure bug bounties. If your unproven company can't be on the hook for $250,000 bug, why should anyone trust it with their banking info? Basically there are not enough signals here for me to believe they are life-or-death serious about it. I know it sounds dramatic, but people's finances, careers, lives, etc can be destroyed by mishandling the information that flows through the browser. They need to take it that seriously, and signal that to everyone.