Whistle-blowing and public pressure does help in improving working conditions for all workers at tech companies.
Example
Article highlighting lack of benefits for contract workers at Google https://www.nytimes.com/2019/05/28/technology/google-temp-wo...
Result- Google instituted new policies for contractors who now get full-time like benefits including healthcare, sick and parental leave https://www.wired.com/story/google-require-suppliers-give-be.... That's 120,000 workers that didn't have benefits now get benefits.