Shopify 16,800 miles deal today. I signed up, was it worth it?

TLDR: I think I just paid $39 for 16,800 miles but I'm not sure. Did anyone else do this deal? Was it a good deal to take advantage of? Did you guys see it in your portal?

I "purchased" the Shopify offer through the portal today for a reward of 16,800 miles then I signed up on Shopify and they basically waived the first few months, first month free then $1 then $3 or something of that nature. After 3 months, the full retail billed once a month is $39.

To my understanding the offer was 16,800 miles once you pay them a full non discounted monthly amount. I called Capital One to verify and they said I did indeed get the 16,800 miles reward attached to my Venture X account. Not the greatest deal? I'm wondering if anyone else caught this one? If so, why or why not?

It looks like the basic option on Shopify for one store at full retail is $39 monthly. So once I pay that after the free 3 months... since the first 3 are essentially free then I'd be paying $39 for 16,800 miles?

Am I understanding this correctly? If so, wonderful deal? I think? Then I'll cancel after the first retail full price payment? I guess. So $39 spent for 16,800 miles? Was that worth it if I'm correct?

Thanks! Would love to hear if anyone else did this one!