A vow of poverty? Just like the monks are supposed to take.
Except, the Catholic church takes care of their monks. A monk is fed and housed with "communal property"--everything they bring in is "communal property". You own nothing--everything is shared equally among your group. And, while they have plenty of rules, they also take care of monks when they get sick. They will not throw out monks simply because they get sick, nor for breaking petty rules without plenty of warnings.
Also, before joining a monastery, you are warned properly about the rules. It is difficult to be accepted in the first place. Then, once you get in, you have three more chances to honorably discontinue membership before you are stuck in for life. At each of these stages, you are aware of all the rules and expectations. They are upfront about that you are expected to go to church 7 times per day, including once that interrupts your sleep. The church is right on the property, so there is no charge to go to and from church. (Unlike in Beth Hell, where you get charged $3 per trip to the Kingdumb Hell). And, all their rules are posted online, if you know where to look. They generally abide by the law of St Benedict, which is fairly easy to research online. Which is more than can be said about the rules at Beth Hell: You find out what they are after you signed in, and you cannot honorably discontinue your Beth Hell membership.