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I believe it's not a problem because Googlebot spiders with US IPs so it can't recognize if I redirect foreign traffic or not.
What's your opinion?
True. Multilingual sites are a very good way of catching international traffic.
The problem with Google however is to get good rankings for the multilingual content.
If you won't let Google know about alternative languages, you won't rank....
So if you have links to the alternative langs Google will index them and display upon queries fro appropriate keywords, in that languages.
Redirects are done by a lot of huge multilingual sites. Basically it's cloaking. Prominent examples are large well known search engines, like Google, Altavista et al.