I think this rule is not friendly, component naming good or bad should be directly decided by Vue? And it also enables and throws errors by default.

Please google how many developers it causes trouble

You are free to disable this rule. But it is the first recommendation in the Style Guide, so the rule makes sense: https://vuejs.org/style-guide/rules-essential.html#use-multi-word-component-names

You are free to disable this rule. But it is the first recommendation in the Style Guide, so the rule makes sense: https://vuejs.org/style-guide/rules-essential.html#use-multi-word-component-names

So why create a rule with the highest disable rate and enable it by default?

Because it is in the style guide and prevents errors. Note that you can also ignore single component names:

https://eslint.vuejs.org/rules/multi-word-component-names.html#options

I know it can be disabled and just saying it's BAD design.

At least it should just be a warning

That is something that can be discussed. Please open a new issue for that, with some evidence that this rule is really often disabled.