Picasa as well, though Google nowadays does a pretty great job at getting all pictures you have on your account together with https://get.google.com/albumarchive/
Pity that once uploaded there's no way to get your data back from Google. API scrambles EXIF location metatada while Takeout, besides being pain to use on an ongoing basis, fails if you store too many files.
That's probably the best once can do other than reverse engineering the protocol used by Google Photos Android app - as that app seems to be able to download files with full exif, unlike official API.
Unfortunately, as mentioned, multiple users report that Takeout does not work once you get past certain size (I have 350GB and it fails every time). It's been failing for years, probably always. Of course Google doesn't care.
I guess if someone was in EU they could try to ask Google for their data under GDPR data portability, face inevitable non-answer and then go to court if they are determined enough.
Google has blocked access to their APIs for migration[1] which IMO contradicts with their stance on data portability[2]. It is hard to assume good intent here.
As the famous saying goes, never ascribe to malice that which can be explained by incompetence. This is Google we are talking about, they are infamous for their lack of strategic focus and disorganization.
