Btw religions forbid interest for very good reasons.
By preventing anyone but rich people to have access to capital, while at the same time sounding like a policy that most people would support?
As an economist, I still think consumer lending (excluding consumer lending that is actually funding investment like mortgages and vehicle financing) in 2022 is pretty questionable and only economically logical in a minority of cases, and that it would make sense to restrict/regulate some of it more heavily.
A classic economist would say that the 1st example proves that its the same as cash and thus nothing much should change, but behaviourally there is endowment bias etc. I wouldn't be surprised if paying people in savings/investments and then letting them liquidate would result in a much higher saving/investment rate than giving them cash and expecting them to invest.