While the metaphor of workers as "slaves" tied by their salaries captures a certain critique of capitalist labor systems, it overlooks the complexity of modern employment and the potential for reform.
Things have changed over the years, it is no longer a simple capitalistic outlook. Companies help employees and employees work for the company.
Workers do have agency, though the balance of power between employer and employee can vary greatly depending on the system and context.
If there any alternative? I dont think so. If someone argues that one should try to become their own boss, the simple counterargument is that if everyone was starting their own business who will work under them? No company can run as one man army, it is always a team job and immediately the need for workers come in.
To be honest, this system is like that and its beyond change, we just have to accept it, or else get born in a rich family.