I seriously doubt it is for the money.

It said they are funded, but it doesn't mean they lost control or have to be VC hyper growth. Apart from Notable Capital and Amplify Partners all others are individuals. There are lots of benefits having these group of company founders and CEO as investors. They are likely interested in the problem space as well.

Had it been hyper growth startup you would be looking at a16z or other bigger names.

1. Accountability - even very talented people can lose motivation or get distracted. Having investors to report to helps with this.

2. Recruiting - many people would be wary of working on a rich guy's pet project. Taking investment makes it more of a real company that has to deliver something and is not subject solely to the whims of one person.