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I see arbitrage opportunities that have 100% profit, is that real?

Answer:
In theory yes. There are several reasons for this:
A naming convention (two different coins who use the same ticker)
An offline wallet.
Outdated forks: an exchange can be running an old version of a protocol and still be trading actively. Outdated forks tend to trade higher and are very difficult to spot. This happens mostly on low liquidity exchanges.
If none of the above events is present, then opportunity may be real. Proceed with extreme caution.