There is no guarantee of success. There is a lot of luck involved.

Look at Robert Pera who founded Ubiquiti Networks. He was working on an idea his bosses ignored on he own during nights and weekend and then founded his company.

https://en.wikipedia.org/wiki/Robert_Pera

Jensen Huang said when they started Nvidia at one point they were thirty days from going out of business.

Also compare the TinyPilot (at $399) to the open source JetKVM ($69) which is supposed to come out soon.

https://jetkvm.com/