View-based streaming royalties (“residuals”) were also something won in the strikes. They previously didn’t exist for streaming in the same way they did for cable tv or theatrical releases— no matter how successful the show. That’s part of the reason streamers didn’t want to release numbers in the first place.
There were still a lot of other factors then and now when it came to payment—mainly due to the fact the minimums are floors, not maximums—so it isn’t exactly a “flat fee”, but there is a “minimum floor” payment schedule based on a formula of # episodes, genre, # weeks, studio budget, season #, etc. Now it includes # views, when previously it didn’t.