A lot of stuff got prioritized for Arm/M1 compatibility... and fast as soon as the first M1 Macs released. Docker, node, in addition to Apple software.
Well, to be honest it was probably macos+M1 platform support. Docker runs a virtual machine with Linux in it on macos and windows, not sure improvements there directly translate to server workloads. I am not sure about node, but it was surely working very well on ARM before that, although it might gain some optimizations thanks to M1.
Although Node.js existed for ARM, often there wouldn't be pre-built binaries for whatever version/native dependency you needed. M1 has significantly changed that picture.
