They've been batching withdrawals since 2017, and Coinbase internal money movements have never required on-chain transactions
The extra optimizations they've been doing in 2020 are a really big improvement. Coinbase should publish their optimization methods in detail, so that everybody can benefit
I realize people might be tempted to downvote this because it's Coinbase related but I urge the opposite since it's actually a good demonstration to other exchanges on why they should implement transaction batching which is not only good for the network, but good for exchanges and good for customers!
we’ve realized 75.2% savings in transaction fees and have passed all of those savings on to our customers. We’ve also reduced our daily transaction count by 95%.
This is huge. For those running exchanges, run the numbers, batch your transactions!!!