This is 20x higher than what each user currently brings Reddit in revenue, but I'm betting that Reddit is going to be cranking up the monetization hard in the next few months.
Reddit Premium is currently $5.99/mo, so the bean counters probably see $2.50/mo for API access for a competing app as long overdue rent. I'd be very surprised if we didn't also see a big push to drive up the ad revenue on free accounts (more pushes to get on the app, ad-blocker-blockers, etc.)