If we place too many restrictions on how companies should offer preview releases, they'll just stop entirely. Are you suggesting that even those comfortable taking on risk to get a sneak peak should be forced to wait for general availability?
I think SLAs are literally worthless since I don't think they encourage even slightly more effort in minimizing whatever issues the customer is concerned about. No one wants servers to go down, no one wants to shut down a service. That a few Google bucks might be on the line would have zero impact.
But if the 3 seconds becomes 6 seconds... Or the price goes up... Or they announce they're end-of-life'ing the product...
Just move your data somewhere else.
Sure, it'd be inconvenient (and maybe expensive) to move. So, you balance all of that out in your mind, and maybe this is the right service for you, and maybe it's not.
If I lose my AWS Glacier stored data (or Amazon bump the prices intolerably), I'll upload it to a competitor _from my local copies_...
Admittedly, I've only had to deal with storage topping out in the tens of terabytes range, so I've never needed to go beyond a dozen or two consumer-grade drives to keep a pair of rsynced copies locally - but I think that same kind of techniques scale all the way out to building your own Backblaze style storage pod if needed.
You're thinking about data that can't be lost, or your customers are screwed. Not all data is like that.
Log files come to mind. They're _nice_ to archive for a long time, but in many businesses, they're certainly not _critical_ to archive for a long time.
Intermediate files, too. You retain the original files in secured storage. But because the intermediate files are large and expensive to re-create, you keep them here in AWS.