Based on my cheatsheet, GNU Coreutils, sed, awk, ImageMagick, exiftool, jdupes, rsync, jq, par2, parallel, tar and xz utils are examples of commands that I frequently use but whose developers I don’t believe receive any significant cashflow despite the huge benefit they provide to software developers. The last one was basically taken over in by a nation-state hacking team until the subtle backdoor for OpenSSH was found in 2024-03 by some Microsoft guy not doing his assigned job.
I too remember how AT&T was broken up only for most of its Baby Bells to remerge back into Ma Bell.
To prevent this for future breakups, I say the content and services sold by big tech should be made competitively compatible and interoperable via nullification of DRM laws; people buy music and movies and cloud storage; let them legally move their purchases to any competitor and big tech companies will break up naturally as local competitors emerge from people who dislike big tech for their own reasons. Monopolies cannot be trusted to lower prices for content and services. Legally nullifying DRM is like the FCC telling customers in 1968 that it was finally okay to ignore the “Bell equipment only” legal warning that had kept them locked into leasing their telephone sets for usurious amounts from AT&T for decades. A few years later, in 1982, AT&T was broken up. AT&T is almost a total monopoly again, but phones remain interoperable.