I’m not sure if you’re joking or not, but the behavior of journald is fairly dynamic and can be configured to an obnoxious degree, including compression and sealing.

By default, the size limit is 4GB:

SystemMaxUse= and RuntimeMaxUse= control how much disk space the journal may use up at most. SystemKeepFree= and RuntimeKeepFree= control how much disk space systemd-journald shall leave free for other uses. systemd-journald will respect both limits and use the smaller of the two values.

The first pair defaults to 10% and the second to 15% of the size of the respective file system, but each value is capped to 4G.

Are we really going to start this pointless discussion again? They are two licenses with different use cases and different considerations. GPL has a lot more mental overhead to using it, MIT is hands off, both of these aren’t inherently invalid.

Also Tanenbaum in your own link mentions that Intel probably would have just written their own microkernel if need be.