[adgjlsfhk1]

Minecraft for somewhat silly reasons was largely stuck using Java8 for ~a decade longer than it should have which meant that it was using some fairly outdated GC algorithms.

[NooneAtAll3]

"silly reasons" being Java breaking backwards compatibility

decade seems a usual timescale for that, considering f.e. python 2->3

[kbolino]

So much software was stuck on Java 8 and for so long that some of the better GC algorithms got backported to it.