I've got 6k hours on Official Legacy and I'm GLAD they are closing the servers down and making them available for download. After 5 years of making sure my stuff is fed/rendered once a week it's gotten rather tiresome.
I'm an over the road truck driver and use my cell phone data to play. There are times when I get stuck in BFE parts of the US for days at a time waiting for loads. Several times over the years I've lost good chunks of my progress to decay. So to finally get a current save and change settings to never lose my stuff like that is a godsend.
I cannot for one second believe the people who bought the game 8 years ago and even 1 year ago seriously believe official servers would exist 'forever'. That's insane.
I will be buying both ASA & ARK2.