The news is unfortunate for older fans, but all of the games being affected are at least a decade old, meaning the servers were available considerably longer than some other titles. Taking down the multiplayer servers for older games is not uncommon, especially for series where disabling the multiplayer capability for older titles allows more resources to be dedicated to newer, more popular titles such as Rainbow Six Siege.
That means that any fans of the older Rainbow Six titles should make sure to get a few multiplayer matches or terrorist hunts in while they still can.
Ubisoft has announced that some older Rainbow Six titles are being taken offline later this year.