I agree with what you're saying, I'm mainly quibbling with the language of the structure of the proposed investment instrument. It would be very easy to do some Hollywood style accounting so that the business owner and employees all get a fraction of gross revenue after costs, but any investor would get zilch for all time.
I know little of accounting, but I know that much :-)
(This is of course orthogonal to the ethical / moral dimensions)
Unless the fixed return is something intolerable to the startup, such as 100% return, that would make a terrible investment. Even ignoring the go-big-or-go-home type of startup in SV, the vast majority of startups that seek to make profits from day one do not succeed - they'll fail and the investors lose the loan. The only situation in which this makes sense is for the loan to have a very very high return - usually a multiple (1x, 2x, etc), since investors will need that rare winner to subsidize the losers. This is how the entire VC industry in SV works, and it definitely still applies even if you want to make a profit-first company, it just applies to a sightly lesser degree (usually for VCs in SV, one company in their entire portfolio will need to deliver 50x+ return). This is also bad for the startup because now they have this loan that they have to pay back in X years that has a huge interest rate.
Essentially, this is bad for investors because investors get all the downside, but their return is quite capped.
A successful growing business is never profitable, most / all the profit is reinvested in the business. There will per se be no investor return relatively speaking.
I recently saw an article this past week that suggests a better structure: the investment is a loan that is forgiven if the business folds.
This is actually better for both sides: the investor gets their money back with some fixed return if the biz succeeds, and the business doesn't have to pay it back if it fails.
Then it becomes a small tech business entrepreneurship Loan/ investment vehicle. In which case the pitch to the city is the their investing in furthering local biz growth in a way that has potential to have a multiplicative return for local industrial base.
Tl;dr no small privately held biz is ever truely profitable, structure it as a forgivable loan upon biz failure.