It's much easier to become a shareholder than to become an employee. Today it takes about an hour, you can do it online, and you need just 50 EUR. Of course, the real trick is in making profit - and now it's up to you to show how invaluable and company-making-or-breaking your skills are - as they should be if you're asking for the full upside.
Can't do it? Then you have to share with sales, marketing, accounting, tax consultants, finance, auditors, lawyers, internal IT, HR, post-sales account managers, customer support, office managers, other engineers - and of course the people who keep it organized, and the people who took a risk and funded it. Seems fair to me.
Consider the opportunity cost of providing capital: if I invested my capital into NASDAQ100 accumulating ETF, I could reasonably expect 10-15% of yearly tax-free[0] profit stored in a safe asset that can be liquidated at any time. Potentially much more profit - last few years were great (20-40% p.a.). You have to give me more if you want me to risk my capital in a custom illiquid and unregulated over the counter deal, and I mean a lot more.
[0] In my country if you hold an asset for 3 years, you don't pay capital gains tax - this doesn't apply to dividends or any other form of income such as interest or rent. But the accumulating ETFs are fully tax free after 3 years - including the dividends and the gains. You just sell when you need money, no need to "reinvest" manually.