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If it's multisite,"someone deciding to change the domain with Wordpress and only changing the site URL" isn't something you'd concern yourself with - I only mentioned it as there was a chance they'd split a regular Wordpress site (presumably) in error. If you're using multisite this isn't a concern. Using Multisite for a single site (as the name suggests) isn't common, so there was a smaller chance of it being multisite; I just wanted to cover all possibilities.