If you haven’t, here’s the tl;dr recap:
For years now, many in the Reddit community have used third-party mobile apps — like Apollo — to read and post to Reddit. That’s partly because Reddit for a long time didn’t have its own app. It’s also because Reddit made it cheap to develop a third-party app. Reddit’s API (the gateway that lets third-party apps post data to Reddit) was free. So Apollo could do its thing without incurring a lot of data costs.
That changed quickly in recent months, when Reddit executives announced they were adding new charges to their API.