Coinbase being shady?

On November 15, 2020, the Bitcoin Cash network underwent a chain split and created a new Bitcoin fork called eCash (XEC). This means anyone who held BCH at the time would also hold the equivalent amount of XEC (times 1 million since XEC redenominated the base unit to 100 sats instead of 100M sats).

While Coinbase did announce prior to the split that any users who wanted to ensure they had access to the newly forked coins would have to withdraw their BCH beforehand so they could hold their own private keys, I'm guessing many customers ignored the announcement and simply left their BCH on the exchange.

So my question is, what did Coinbase do with the forked XEC? Did they lose them? Did they sell them to another exchange? Do they have any intention of airdropping the coins to their rightful owners?

It has now been over 3 years since that fork, and the eCash network has not only survived but made significant technical progress. Currently trading at ~12% of the BCH market cap, if Coinbase were to do the right thing and give customers who held BCH on their platform in November 2020 with the XEC they're owed, it would be like an instantly 12% gain on their BCH balances.

Other top exchanges like Binance and Upbit have done the right thing. Why hasn't Coinbase?