I wish I knew why older Halo series are shutting down their servers…
I think put simply, it’s just too expensive and impractical to continue moderating these games indefinitely. I wish they weren’t shutting down either, but they had a good run.
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Cost of maintaining the aging infrastructure of those titles’ online services
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Hardly anyone playing the legacy titles nowadays since they are more modern platforms and infrastructure to host & play those titles online (you can argue whether those platforms are inferior compared to their original counterpart if you may)
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The ever growing instability of the servers which is seen as a waste of time and resources to put into due to the reasons above
Upkeep and tradeoffs.
Why run older servers for unpopulated games when you could run new ones for newer games? That sort of thing.