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Geth is by far the most used Ethereum client. It's written in Go and it became the basis for dozens of other successful smart contract blockchains. Geth has been developed and optimized for a while so many projects either fork Geth or reuse parts of it instead of developing everything from scratch.
A lot of great answers already here referencing Go’s ties to Ethereum. Another factor for Go’s popularity in crypto/blockchain projects is the Cosmos SDK. Go is the default implementation and many DeFi projects are built with the Cosmos SDK