Does an international porn site like Pornhub take accents into account with their algorithm? Does an Australian watching Pornhub porn tend to get more porn with Australian accents than an American?

What a weird way to phrase a question. If you're accessing Pornhub from Australia, it will probably result in a feed more algorithmically suited to Australians, and if this feeds happens to feature Australians, they'll have the Australian accent.

Accents are not a factor, but the location of the upload, tags, and title are, which indirectly makes accent a factor. Unless we're talking about kinks, PH won't recommend videos based you your accent alone.