I used and enjoyed Pocket, but never paid a dime for it so I can’t imagine that Mozilla made much if any money off of me. That’s probably true for most users, and as such it’s not difficult to imagine that Pocket ended up being a bad purchase for Mozilla in terms of diversifying income.
There's a small group who complain loudly about Pocket, a small group who are really sad to see it go, and probably a much larger group that either doesn't know what Pocket is or doesn't care enough to write a comment.
It's important to keep this in mind when reading online discussions in general.
I did subscribe to Pocket Premium for a while but it wasn't really worth the money (plus they were being arseholes when I was asked for API support.)
And if you're keeping stats, try to find at least 1% of "hypocrites" who claimed it was a "scam", but are now "sad"