I have no experience with macs, yet I looks like either:

- OS issue, not being enable to remove applications (or an exploit)

- a chrome one(!), actually chrome installs it on demand as it remembers doing it earlier - likely an url protocol handler.

There are worse things with poor solutions including being able to survive OS reinstall... The infamous Minix - "Are you scared yet"[0][1]

[0]: https://tech.slashdot.org/story/17/11/07/1041236/minix-intel... [1]: https://itsfoss.com/fact-intel-minix-case/