Not only that but if you edit the MIT licensed files (Read: They have the MIT notice, which you have to preserve, in them.), they will still be MIT licensed. Only new files and the entire project will become GPL.
I am not a lawer.
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The reason Ubuntu switched was Rust's "safety". Which is sort of a dumb reason because Coreutils have had very few CVEs in the past. A less dumb reason is performance. Uutils are faster than Coreutils, this was an edge-case.
MIT license is the schizo reason. Making a closed source version of Unix utilities would not be beneficial for Canonical in any way, but that does not stop the schizos from schizoing.