The reality is a bit different.
They didn't "realized the potential of Bitcoin", They realized the money they could make
The banks aren't really interested in Bitcoin, nor its technology. All that matters is profits. Once there is no more they will remove that option as well.
I could not have put that better than you did there! We should not fool ourselves thinking that the banking system is becoming bitcoin-friendly, the reality as you pointed out is completely different. Where there is money to be made the vultures and the hyenas arrive.
Like I mentioned somewhere else, I hope that with a fast taproot activation we can regain some new freedom corners in the bitcoin evolution.