I couldn't find a complete list of all bitcoin address with balance on the web, so I decide to put up one myself, and I plan to update the list weekly.
https://bitkeys.work
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https://bitkeys.work
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And you are sure that the randomly generated addresses are not already checked by you for possible balance before they are displayed on the page?
Would at least make sense or you really are a benevolent person.
For the record, no. I don't check it sneakily. In fact, each address generated is automatically linked to blockchain.com, it's a bit cumbersome but you do have the means to verify the balance on a 3rd party website.