At the moment without a required configuration, a single use coupon can be applied many times.
Simple check to see if there is missing config:
There's no "sales.rule.update.coupon.usage" consumer listed in the app/etc/env.php file.
$ grep -i usage app/etc/env.php$
To fix this issue, the steps from this doc has to be implemented:
Instead of having this issue which affects many users, can this bug be fixed by adding the setup (fix) as default as a patch or added to future releases of Adobe Commerce?