Sneaky as in the wording doesn’t convey that they are getting a benefit (which they are). And it’s also written to intentionally confuse using wording like “use our affiliate link”. Who is “our”? It’s just one person who is trying to make some cash?
It’s just so out of place on the platform and shouldn’t be allowed IMO. Especially added by a mod in the sidebar of a community. Better approach would be a stickied post with affiliate links posted by users or something similar.
“If you’re interested in joining Wealthsimple, you can take advantage of our referral link. By using it, you’ll receive up to $3,000 in cash to trade stocks or crypto when you fund a DIY trading or Managed Investing account. Use code XXXXX or the link below to sign up.”