Earlier quoted context omitted.
Isn't this always the way. Crowd source development and ideas to see what gains popularity, and then build those features into your thing or buy the 3rd party thing to rebrand as your thing. That's like startup culture 101
Another thing that probably irked Reddit was that Apollo, RedditIsFun, and the other popular clients were monetizing their apps by including their own ads, charging a one-time or monthly fee. I'm surprised that wasn't against their API terms.
It was about maximizing the value of the IPO by ensuring investors would be minimally aware of the failures of the app and new Reddit, by ensuring as few 3rd party products exist as comparatives to the first party offerings.
It could be argued to be part of a conspiracy to defraud investors by ensuring they were incapable of being fully informed....