Scrapers won't be stopped by needing an account; in the recent discussion [0] about this, someone mentioned that there's even a JSON API you can use - by appending .json to any post! It's to drive engagement... for the advertisers. They gotta keep the valuation up after the IPO.
I exposed this JSON API in the same style as their original API at api.reddiw.com and they banned my account without warning. I explicitly included my reddit username in the user-agent so that they could reach out if they had a problem with it. Nope, straight to banning my decade old account.
[0] https://news.ycombinator.com/item?id=49015533