If I reboot and issue:
/etc/init.d/dnscrypt-proxy restart
root@wrt:~# logread | grep dnscrypt-proxy
Thu Jul 30 13:12:41 2020 daemon.err dnscrypt-proxy[1227]: [2020-07-30 11:12:41] [NOTICE] dnscrypt-proxy 2.0.44
Thu Jul 30 13:12:42 2020 daemon.err dnscrypt-proxy[1227]: [2020-07-30 11:12:42] [NOTICE] Network connectivity detected
Thu Jul 30 13:12:42 2020 daemon.err dnscrypt-proxy[1227]: [2020-07-30 11:12:42] [FATAL] listen udp 127.0.0.53:53: bind: address already in use
Thu Jul 30 13:12:43 2020 daemon.err dnscrypt-proxy[3219]: [2020-07-30 11:12:43] [NOTICE] dnscrypt-proxy 2.0.44
Thu Jul 30 13:12:43 2020 daemon.err dnscrypt-proxy[3219]: [2020-07-30 11:12:43] [NOTICE] Network connectivity detected
Thu Jul 30 13:12:43 2020 daemon.err dnscrypt-proxy[3219]: [2020-07-30 11:12:43] [FATAL] listen udp 127.0.0.53:53: bind: address already in use
Hm.. just reboot:
Thu Jul 30 13:23:12 2020 daemon.err dnscrypt-proxy[1227]: [2020-07-30 11:23:12] [FATAL] listen udp 127.0.0.53:53: bind: address already in use
Thu Jul 30 13:23:12 2020 daemon.err dnscrypt-proxy[1227]: [2020-07-30 11:23:12] [NOTICE] Network connectivity detected
Thu Jul 30 13:23:12 2020 daemon.err dnscrypt-proxy[1227]: [2020-07-30 11:23:12] [NOTICE] dnscrypt-proxy 2.0.44