Hotmail is a good example too. I remember it being pretty ubiquitous, at least for the 'personal email' crowd, and it seemed implausible that people would give up on what was often their main email 'location' for another offering without being able to transfer their often important and personal stuff. then gmail came along.

VisiCalc, CP/M, BlackBerry and Yahoo definitely got a golden goose; it's long after establishing their dominance that they failed at maintaining it.

IBM owned literally the whole market on computers at a time when computing equipment was prohibitively expensive and centralised.

> the list is very long

Tesla is lurking as well