API is changing in a few days, not being dropped. I haven’t dug into it but I’m not too worried that usage will go above free tier. If that dies there’s the .json versions of the site you can view by adding .json to most reddit URLs, and even if they kill that there will always be scraping.
It’s possible but kind of pointless. Who wants to read a bunch of comments of people being wrong and not even be able to respond (directly) to them?