ELi5: Since when did the suffix "-Gate" became associated with controversy and tragedy?

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The original was posted on /r/explainlikeimfive by /u/Preston_of_Astora on 2023-06-25 15:21:04+00:00.

Yes it's OceanGate

But it also led me to revisit past controversies like ChargerGate and GamerGate.

Since when did the internet just decide that the suffix "-Gate" is the denominator of something being marked for controversy?