From the article:

The uBO team members are all volunteers. They’ve gone above and beyond to meet every little request from their users. But there’s a limit to how much they can take. At some point, the constant demands become too much, and they will leave uBO for good. It’s one thing to play cat and mouse with YouTube. It’s quite another to deal with a wave of angry users.

It’s important to note that this extension is open source, and anyone can contribute. End users can contribute by writing more meaningful reports and exhibiting patience, and those who are handy can certainly contribute to uBlock Origin. Just about anyone can help in some way.

Of course, every project needs passionate leaders, which is where the maintainers play a role. They coordinate work and ensure quality. While lots of people can act as a leader, the passion of driving a project to success with unique expertise is a lot more rare. So treat your maintainers kindly!