> An example of a lock-in is excel back in the time when the format wasn't public.
It wasn't public but it was reverse engineered and supported by things like OpenOffice. Anything, especially a file format, that is both proprietary and popular gets reverse engineered at some point.
An example of a lock-in is excel back in the time when the format wasn't public. Wanna use something different? have fun manually re-entering your sheets in your new software.
How can GitHub CodeSpaces even cross your mind when thinking about lock-in? This is like saying the textbox on HN is a form of lock-in.