This is an Ubuntu mechanism, and would send reports to the company which maintains Ubuntu, Canonical. I think this is mostly anonymized, but there may be some incompleteness to this, such as file names. When you manually allow this from a GUI it offers to show you all data, and it does not just submit without asking. When the data is presented it allows editing or removing items.
This is a command line way of disabling crash reports:
https://www.linuxbabe.com/ubuntu/disable-apport-error-reporting-ubuntu-16-04-lts
The gist is to edit “/etc/default/apport” to be “enabled=0”, and probably to also disable the service via “sudo systemctl disable apport”. The file edit will work even if the crash mechanism runs, the “disable” will prevent this from running automatically.