As The Verge notes, Apple is now listed as a contributor along with Facebook, Google, Microsoft, Twitter and others.
Apple will build systems that make it easy to add and remove data from iCloud, similar to Google Takeout and Facebook's Access Your Information tools, which are compatible with each other and allow data to be downloaded to your hard drive. [1
Finally, the Data Transfer Project hopes that data can be transferred directly from service to service without the need to download data first.
Since the Data Transfer Project was launched in July 2018 with Twitter, Facebook, Google and Microsoft on board, 18 contributors from a combination of partners and the open source community have deployed more than 42,000 lines of code and modified more than 1500 files, and new framework features and APIs have been added.