If investments didn't grow at a faster rate than interest, why would anyone ever invest money at all instead of putting into a savings account? I don't know why

If investments didn't grow at a faster rate than interest, why would anyone ever invest money at all instead of putting into a savings account? I don't know why it''s hard to imagine that a large loan with a relatively low interest rate might be able to be invested for more than enough profits to pay off the taxes and the loan with some to spare