There is no one definitive answer to this question, as it depends on the website’s content and what kind of audience it is aimed at. Generally speaking, though, anyone with a web browser can like a WordPress blog.
If the blog is dedicated to promoting or selling a product or service, then its readership might be limited to people who are interested in that particular product or service. On the other hand, if the blog is simply informative or entertaining, then anyone with an internet connection can enjoy reading it.
Ultimately, the decision of who can like a WordPress blog is up to the blog’s owner. If they want their blog to be accessible only to people who have purchased their product or service, then they should restrict access to those who have done so.
Otherwise, anyone with an interest in WordPress and an internet connection can like the blog.