This is always the risk with software which requires activation. Your license can effective be cancelled any time without warning, and for any reason. There will always be a grey area when it comes to software licensing - how many legitimate Windows keys have been hit by WGA false positives over the years? But companies shouldn't make arbitrary global decisions without considering what the law actually is in the countries where the transactions actually took place.
Adobe shut down the activation servers for their CS2-era products a few years ago. They made activation-free versions available to download for most of the affected products... but not all. :rolleyes:
The software may be old, but it is still more than adequate for most users' needs. And in a few cases it was not developed further, so there is no newer version to upgrade to.