The solution to problems of lablor mistreatment is to quit and get a job at another company that treats their employees better.
In general, I would argue for more diversity in company structures and better education about alternative organizational models (i.e., talk more openly about the pros and cons of all forms of organization - not only from a profit making but a societal perspective). It seems to me that there is a strong dogma of how things need to be done in start ups. But maybe I am wrong, I am still working at a German University so maybe I am misrepresenting the situation in your country.
However, observe that their goal is not to tackle abusive working practices but apparently to take over the firm and impose a "social justice" agenda on it:
enrich Kickstarter’s charter commitments to creativity, equity, and a positive impact on society
promote our collective values: inclusion and solidarity, transparency and accountability; a seat at the table,”
"equity" means equal outcomes e.g. 50% of all jobs being reserved for certain genders, races, etc. "Inclusion" is a codeword for the same thing.
Obviously the goal of forcibly converting Kickstarter into using identity politics based management isn't something they can achieve by just going to work elsewhere, as would be the case if they were being mistreated, because Kickstarter would just hire replacement employees.