I personally have wrote over 2,000 reviews on Dooyoo I think (check the community pages I was top 10 of all time until I stopped writing there).
I ALWAYS posted my work on Dooyoo AND Ciao. I posted reviews I'd posted on Tripadvisor no problem too.
Occasionally they would have a request on a specific item for it to be a unique view, and I followed the guidelines.
I hope Dooyoo have sorted out their problems now. I stopped churning out 5-10 reviews most days because they were faffing around with paying me, still, I made about £5,000 in the time I was a member so not bad really.
Don't be tempted to post any of your reviews from anywhere else onto Amazon though, as they will just stop you from being able to write reviews and become eligible for the Amazon Vine program - they want unique posts.
So to sum up you should be fine to do it , I always did and I usually just put a note at the bottom saying 'This review has also been posted elsewhere under the same username'. Obviously if your username is different elsewhere you could say what it was.
The T&C may have changed since I last wrote there, around 2 years ago, but I doubt it. Dooyoo has gone drastically downhill since 'updating' their website. They overpaid a load of members, messed up the accounts (when I logged In I saw someone else's account details!!
) and then the people who had genuinely earned their money were told they couldn't cash out until they could work out who was owed what, which never seemed to happen. Hopefully you're a newer member and this won't affect you.
I was personally pretty miffed that I'd wrote so many reviews over the years (some with 10,000+ views) only to find that they were treating me like crap when I tried to redeem a £20 gift voucher.I've moved on to better moneymaking ventures now (link to my favourite sites in my signature) so I don't miss the money