The 2007 strike was mostly focused on DVD and syndication royalties. Internet streaming was not a major player.
This strike comes after the explosion of internet streaming and the 2020 repeal of the Paramount Decrees.
Movie studios now have the right to control the distribution of their produced content (whether it be theatrically or streaming).
This used to be a major obstacle for old studio systems like Paramount because they were constrained by rules not applicable to companies like Netflix and Amazon producing and releasing their own content.
A lot of these WGA negotiations used to hinge on royalties that were tied to profit sharing from box office numbers. When productions are shifted to streaming platforms, it can change how the viewership numbers are calculated to determine profit sharing. It is also up to the companies themselves to provide streaming numbers (which they do not like to share), which adds another layer to the negotiations because the formula to standardize this count needs to be negotiated as well.
I would not be surprised if streamers started vertically integrating and creating their own bubble of non-union productions and hyping up their own superstars similar to how the old studio system used to exist from the 20s-40s.