Coinbase HAS BTC available.
Furthermore...
Things are a little different than on November. A lot of people are using BTC to buy altcoins, particularly ETH had benefits by going undeservedly high without any match in something real, having RSI(14) in eccess of 81% yesterday and >83% at my last editing time.
All the first 16 cryptos by market cap are loosing bar ETH NEO (China's ETH if my memory serves well) and ICON. Conclusion: many are cashing out BTC mainly for flat/ETH. Why?

1)https://www.coindesk.com/bitcoin-faces-bearish-move-as-prices-drop-towards-15k/
"Caixin Global reported last week that local regulators in China may not longer offer discounted electricity and tax deductions to mining companies. Further, a leaked document now suggests that China's top internet finance regulator is requesting that local governments push bitcoin-mining operations towards an "orderly exit" from the industry. "

2)South Korean banks/exchanges are under scrutiny: https://www.coindesk.com/south-korean-banks-face-scrutiny-crypto-exchange-ties/
Coinmarketcap site removed IMHO more than appropriately and in a timely manner the three big S. Korean exchanges Bithumb, Coinone and Korbit from its average calculations https://www.coindesk.com/the-crypto-market-just-dropped-on-one-data-adjustment/ as prices on those exchanges have consistently traded far above the rest of the market, such as the more than $5,000 spread spread compared to markets like Bitfinex and GDAX.