Unix used LF, Apple used CR, Microsoft used CRLF.
They are all ASCII carriage movement codes, which is about driving the paper feed and print head of an ASR-33 or equivalent.
So they all made the "wrong" decision about what to store in a file.
They just chose different wrong characters.
Unix followed Multics. Multics chose right. ASCII/EMCA-6/ISO646 drafts discussed this at least as early as 1963¹: “For equipment which uses a single combination (called New Line) [...] NL will be coded at FE₂ [Field Effector 2 = 0x0A].”
¹ doi/10.1093/comjnl/7.3.197
I'd say Multics/Unix was technically correct, except this was still the wrong decision for I/O ever since.
The Record Separator is the logical character code to use to indicate the end of a line of text and print position characters, assuming that a line of text is a "record".
Apple hasn't been using CR since the release of OSX (26 years ago). Microsoft could have made the switch at any time too (just as they could have switched to UTF-8 as universal text encoding on Windows), they just choose not to.
In the end it's not the job of programming languages to clean up Microsoft's mess ;)
Why is it Microsoft's fault? They just stayed on their legacy implementation, Linux and Apple chose to move from the legacy implementation to another legacy implementation. That seems dumb.
The issue is that none of the print carriage movement ASCII characters should be used internally to indicate "end of line", because each of the chosen possibilities are used separately to indicate different carriage movements.
The logical decision would have been to choose one of the "separator" characters to indicate "separation of one line from another" and then allow the I/O drivers to decide what to send/receive to/from a particular device.
The fact that both Apple's and CP/M codes came out roughly at the same time, both on microcomputers, shows that it was probably just a design decision.
Some believe Gary Kildall picked CRLF for CP/M since he used DEC TOPS-10 to develop CP/M. see https://www.quora.com/Why-did-CP-M-stick-with-the-CR-LF-stan...