Has anyone tried mining crypto in Singapore? If so, is it legal and is it worth it?

Legal yes, practical no. Electricity is expensive here in Singapore, and also the humidity of the environment and heat will result in greater cost for ventilating systems to prevent downtime of mining rig. I believe there are calculators online to do some vague maths to see if its worth your time and effort.

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If you really are interested in mining . I would suggest reading up on the Helium blockchain. It is a decentralized network provider for IOT devices and others, helping to save cost and improve infrastructure here in Singapore. Im sure we all know our telcos go down sometimes and we are helpless. Relatively new concept providing asymetric risk-reward. As a miner for the blockchain, what you really are doing is basically being a telco for products in your area. Hope this helps!

https://www.youtube.com/watch?v=IXlq5lmGBe4

Maybe you can watch this. Its a very new Ethereum miner and i have ordered one. You can consider too!