Likewise with git. There's the "top-level events" that you see (commits). But even when you're doing 'unsafe' operations, you're working with the lower-level reflog events.

Almost every modern software system. Anything running over the Web is event driven.

99.99% of the data we consume on the Web comes out of databases [call it Transactional-SQL-xxx or ColumnBased-yyy or Elastic-SaaS-zzz].

Well, yes. Databases are event driven themselves.

As is any web application, because the web (at least without sockets) is constrained into communicating events only.

Also, most local GUI applications, because people just like events better for it.

Right. The hard part is already done. Which makes it infuriating that it's all "internal". Every serious RDBMS already contains an implementation of an event-sourcing system, but you're not allowed to actually use it.