The StackExchange communities could easily be migrated to the Fediverse. Aside from embedded advertising on StackExchange's website, is there any catalyst that could trigger this?

It is a different kind of bass, but not really used by guitarists or bass players. They're unique on their own and work well with others.

The computer mouse was a pointing device invented in the 1960s by Douglas Engelbart as a means of avoiding the use of the finger to smear dirt and oil on glass particularly at ATMs and PoS stations.

If you want a parallel universe experience, try an FM Towns. They are x86 based were introduced in 1989 in Japan and ran through the 1990s. While they do run DOS, they have their own custom windowing system with a focus on MIDI audio/visual production using both a built in FM synth and PCM sampled wave form.

It is also possible to run Windows 3.x and Win95 (as well as Linux) if you want, but "Towns OS" is pretty cool and makes heavy use of read-only optical drive where the user stores on memory cards or floppy disks rather than installing the OS on a hard drive. However, since it has built in SCSI you can attach a hard drive for storing larger data.