$ # here dnscrypt-proxy.service is running
$ id dnscrypt-proxy
uid=62582(dnscrypt-proxy) gid=62582(dnscrypt-proxy) groups=62582(dnscrypt-proxy)
$ sudo ls -lah /var/log/dnscrypt-proxy/       
total 11M
drwxr-xr-x 1 dnscrypt-proxy dnscrypt-proxy 156 Feb  6 20:12 .
drwx------ 1 root           root            28 Dec 27 22:18 ..
-rw-r--r-- 1 dnscrypt-proxy dnscrypt-proxy 10M Feb  6 20:10 query-2022-02-06T20-10-43.555.log
-rw-r--r-- 1 dnscrypt-proxy dnscrypt-proxy   0 Feb  7 20:26 query-2022-02-06T20-10-43.555.log.gz
-rw-r--r-- 1 dnscrypt-proxy dnscrypt-proxy 32K Feb  7 20:26 query.log

$ # now dnscrypt-proxy.service has exited
$ id dnscrypt-proxy
id: ‘dnscrypt-proxy’: no such user
$ sudo ls -lah /var/log/dnscrypt-proxy/      
total 11M
drwxr-xr-x 1 62582 62582 156 Feb  6 20:12 .
drwx------ 1 root  root   28 Dec 27 22:18 ..
-rw-r--r-- 1 62582 62582 10M Feb  6 20:10 query-2022-02-06T20-10-43.555.log
-rw-r--r-- 1 62582 62582   0 Feb  7 20:56 query-2022-02-06T20-10-43.555.log.gz
-rw-r--r-- 1 62582 62582 34K Feb  7 20:56 query.log