Employees get to bounce around from company to company, commanding an ever-increasing salary due to the bubble we're in, and usually get a solid chunk of equity to boot. They work their hours, they take their vacation time, they come on HN and wax about the insensitivity of the open-office floorplan, or that lunch is only catered 3 days a week. They have a never-ending flow of job offers in their inbox and when things aren't going their way, they can simply pack up, walk away (with equity in hand), and move onto the next cushy job. They aren't up late at night worried about how they're going to make ends meet the next day, their biggest concern tends to be whether they embrace the latest JS framework or wait the three months til it's supplanted.
I'm sorry if you've encountered founders that treat their employees like shit, but dammit, most of us do our best effort to take care of our employees with competitive salaries, excellent benefits, fair equity amounts, and frequent profit-sharing bonuses. We don't take lofty profits, we invest it right back into the company so we can hire more people and provide better accommodations. But if we come across as thinking we should eventually reap the benefits of a successful company: you're goddamn right we do, we earned it.