I think you can invest in things, but that shouldn't give you any legal ownership rights.

I also think it should not give you any profits, just the ability to protect your assets from losing value over time (inflation, decay, wealth tax, ...). This way people could either start something themselves and make a profit, or invest it somewhere else to try to preserve the value. What they couldn't do is invest and profit from other people's work.

I know this is pretty radical and would definitely need many changes to the way we do things right now, but I strongly believe that decisionmaking and profits should be reserved for the people actively involved in something. If you want to work with companies you don't run then get payed as an advisor or associate, because that is the work you would be doing.