but authors and filmmakers still make TONS of money.

This is an affirmation many writers would find offensive lol

The editorial sector is in deep crisis, it's really hard to live off as a writer unless you're ridiculously famous.

Same thing for the filmmaking industry, look at protest of screenwriters and actors, and to companies terrible financial sheets, and to movie theaters basically bankrupting as maybe their time is over. Also we both agree there's been a shift from movies to tv series and one of the reason is that you "buy the product piece by piece"?

Ps: funnily enough, period publication of chapters were a thing until not long ago, and still are in somewhere (for example manga in Japan)