Comment by bayindirh
I think the biggest contributor to these processes was going open source in their graphics drivers.
They went from "we have tons of 3rd party IP in these!" to, "you don't need to download anything, it's in kernel mainline now" in a generation and they're off to the races after that.
Maybe their Ethernet drivers were open before that, I don't remember but, video drivers made them pass a threshold in maturity IMHO.
Intel embraced Linux when they bet big in datacenters in early 2002. The momentum they got from there, with Linux dominating the sector, made them realize how much of a benefit it is to have a free software stack. With Linux they were able to go head to head with the incumbents of the day.
Linux and x86 became unbeatable in the space for 20 years.
They have known how important it is. They won't forget.