The essence of prop-firm is based on the concept of satisfying the needs or desires of a trader to quickly achieve his goals by realizing trade through non-existent capital. This is a deliberately losing concept for a trader, although it is the most accessible and popular for all traders in terms of building their own capital.
It's not the prop firm that "sucked" - you consciously chose to be deceived when you created an illusion out of ridiculous desires for big payouts and a beautiful life.