I'm surprised we didn't see those two manga authors.
I believe the implication when she said "it's an incredibly fun job" is she's thriving. There's darkness, but she used it like a tool to make her glow brighter, giving hope to others similar to what Ai did for Serina.
They tried a peaceful solution with the whole "Ai loves you" record thing and walked away pretty happy, Kamiki forced Aqua's hand by his attempt to kill Ruby which likely won't stop.
Nino is stop, but chapter 165 shows us that Kamiki has more people to use, and despite the number of victims, no incriminating evidence to condemn him are found.
It's not fake, when she said that the job is a lot of fun to herself around page 20, that was real. You can feel sad while still striving toward your goals and be happy while doing it.
I get that it's not satisfying, but isn't the entire movie arc a large part of why Ruby can move on as shown in the ending? And I'm sure there are others too, I know that Kana and Aqua has a little change during the whole filming.
Ai's lies did keep her isolated and cause misunderstanding, but the manga also shows that lies, manipulation, and "darkness" are essential in the industry (aside from acting being acting, there is also Memchou breaking the gloomy mood after she confessed lying about her age, and Ruby ranking up by pleasing the producer and co-producer during the arc that ended with the producer crossplaying.
Not that said darkness should be kept entirely, the manga also shows bad things not worth keeping, just that it needs to be tempered with aspects like honesty and understanding. Memchou's age reveal and the old producer making his own cosplay to understand the cosplayer's protest are examples of this too, though Aqua saving Akane from suicide along with Akane's reputation with the help of the other actors, actresses, and the cameraman are also example of this.