The Data Liberation Front team was formed at Google in 2007, and released Google Takeout in 2011, worldwide, well before the other big companies had anything similar in place.
To be fair, Apple has for the longest time allowed export of contacts (.vcard), calendar items (.ics), photos (several formats), music (except for music purchased in the iTunes store for some time that was DRMd), mailboxes, etc.
While I feel locked in to an extent because I don't want to give up macOS/iOS/watchOS and their integration, I never felt that my data was locked up with Apple.
Apple Notes is different. Notes stored in iCloud (default for iOS & macOS) are stored in a fairly inaccessible local database. They cannot be exported to any format other than single notes as PDFs. The service offers no public API.
How is that relevant? If anything, that actually goes to show the point being made, which is that Google had this available everywhere before GDPR even existed. Most other companies, including Apple, are only doing this because they have to in Europe, whereas Google did it arguably for better reasons.
The GDPR was wonderful. One of the websites I use had an export option but it only gave some of the data which didn't include the bit I wanted and then the GDPR came along and now I get a CSV dump of every table for my user.
For google, if you don't like the format of Google Takeout (a huge dump of files without UI to browse it), you can also check out a live stream of all data they are collecting:
Yes (at least for Google and Facebook)? I think the types of content differ between regions (EU includes some legally mandated data in addition to the standard set) but user created content is definitely available for download in all regions.
Deployed and available outside the EU, and more specifically in the US?