I'd also note that the severance packages most tech companies have been offering their employees have been very fair, and with tech skills being almost universally valuable across industries it's not hard for good tech workers to quickly find tech jobs if they're happy to work outside of the tech sector.
If people want to form a union then fine, but I'm not sure what you expect. Spotify isn't profitable. With the cost of capital rising and a potential recession looming they obviously need to be financially cautious otherwise everyone at the company will eventually lose their job.