Only manufacturer and company tags are problematic, **specific products are not**. I would say that two tags, intel-cpu and intel-graphics for all products CPUs and graphics card under the company Intel™ is OK. Nvidia is kind of a special case... Nvidia only (or at least most popular since I haven't heard of anything else) products are their graphics cards. Over-atomization of the topic would be counterproductive since you would need a tag for each product on the Nvidia line. To prevent the broken window of "why I can't use X company as tag bug Nvidia can?" let's rename it to nvidia-graphics, or something else. The objective is that isn't another company tag but a product tag.

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As a side note (while I added this the post was a +12/-0), I would not only eradicate them but blacklist them, since they keep coming back.