and there are exchanges that have profitable offerings?
The problem is the offerings, the exchanges are just skimming from us suckers.
You need a trustworthy business/owner that has a business plan to earn bitcoins. That appears to be an impossible ask.
Most of the options of what can happen when you invest bitcoins are bad, it just doesn't make sense. If the price of bitcoin goes down, you get back more bitcoins, but can do less with them, and you lose the ability to use trade those coins yourself while someone else is holding them.
If the price goes up, it encourages them to steal and/or makes it harder/impossible for them to pay you back.
That doesn't even mention the fact that most of these "businesses" have no actual business plan that would stand up to any amount of due diligence. Some nobody is going to run a bank. Another nobody is going to make money investing in the other nonsense businesses. We are going to make mony from pepole selling us money making machines that they aren't using for some reason, etc etc.