This is the best summary I could come up with:

A supermajority of the 52-member on-set production crew have asked to be represented by the International Alliance of Theatrical Stage Employees (IATSE).

VFX workers at Marvel have been unhappy with their compensation and the pace of production schedules in the past, with some claiming they were given nearly impossible deadlines to achieve effects.

“Visual effects must become a sustainable and safe department for everyone who’s suffered far too long and for all newcomers who need to know they won’t be exploited.”

Last year, Dhruv Govil, who worked on Spider-Man: Homecoming and Guardians of the Galaxy, took to Twitter (in a now-deleted post) to slam the company for overworking teams and low salaries.

Marvel has been a center of VFX use in recent years, as the films have been big productions that rely on movie magic to bring the comic book heroes to life.

“We are witnessing an unprecedented wave of solidarity that’s breaking down old barriers in the industry and proving we’re all in this fight together,” said IATSE International president Matthew D. Loeb.

I'm a bot and I'm open source!