I recently added a bunch of themes, which unfortunately had google fonts in them. I removed them but haven’t redeployed that yet. I’m guessing imgur / baidu are images? There’s an embedded picture upload service that comes with this, but I haven’t enforced it, and just like reddit this currently lets people use images from other domains.
They’re images. I had the same question as OP once but quickly figured it out.
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baidu has a cloud service called https://en.wikipedia.org/wiki/Baidu_Wangpan which could be where the images are being pulled from
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