Blogging about anything and everything?

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I've noticed that most blogs focus on a specific topic, whether that be cooking, travel, music or sport. But there are also a few personal blogs (usually names in the firstnamelastname.com format) who seem to blog about whatever they want, all the way from cycling to cooking to their experience of eating a sheep testicle.

Are these blogs still profitable? I've always been told to focus on a niche, and I don't know if blogging about a series of different things is worth it?

Thanks.

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