Should i block people ? (Patreon)

Hello i wanted to ask have a lil talk with you all- There are some patreons who cancel thier pledge to me just shirtly before they actually would need to pay. And then after arround a week they rejoin my patreon, can view the all my content ut never actually suppoted me for that. So my question should i block these ? I just find it unfair to the people who have unsterstood the concept behind patreon that i need some support to create more of my content. Please write your thoughts in the comments on what i should do.