> Who SAP? They are not quite as bad as Oracle but in the same league.

Of course not SAP. However I know that the 3 biggest French banks use postgresql more and more. I know it's a data point but I think it's telling. Also, Microsoft sql server is still growing.

Amazon made considerable efforts to get off Oracle which proved hard as Oracle seem to provide some features for large users that are hard to match. However they got there and are using AMS services. Presumably other large users may be able to go the same route. https://www.theregister.co.uk/2019/04/02/amazon_fulfilment_o... (Aurora Postgres and DynamoDB are mentioned)