Apologies! I actually didn't even notice your question was based on their private credit and not their private equity!
This is actually something that is relatively new with Wealthsimple. With private equity, you are taking an equity stake in these companies, whereas with private credit, you are just loaning them money.
Ultimately, private credit is going to be more conservative in the fact that you are more so worried about protecting your initial capital and earning interest on the loan. You're never going to get game changing returns, whereas in private equity, you are investing in these companies with the hopes of significant upside from the capital investment.
Private credit, you can expect (although far from guaranteed) to earn a rate of interest on your capital and get your initial capital back. With equity, you could realistically end up with nothing.
Think of these investments like high-risk loans that will, in turn, give you a higher rate of interest.
It's not something I'd ever dip into, but I can see it from the perspective of someone who wants to earn a higher rate on their money than a fixed income investment. I'd just make it a very small portion of my portfolio if I ever did dabble in it.