The domain name
It is registered in the name of the website's owner, not the name of the provider. When this is set up wrongly, it is the most expensive thing to get back.
Good practice
The real risk with a website isn't that it costs a lot: it's that it becomes impossible for anyone else to take over. Here is what keeps a website transferable, whatever tool built it, and whoever looks after it tomorrow.
It is registered in the name of the website's owner, not the name of the provider. When this is set up wrongly, it is the most expensive thing to get back.
The hosting account belongs to the client. The provider has access to it, they do not own it.
The project, the original images, the texts. A website you cannot reopen is a website you have to build again.
HTML pages, images, texts. Not a format that only one tool can read.
With the software, the question doesn't arise: the project is on your disk and the website is with your hosting provider. With the online service, it would arise if we had not settled it: the export button is part of the subscription, and it hands your website back to you as pages you can host elsewhere.
We would rather be chosen each year because the product suits you than kept because leaving would cost too much.