I do this steps for check in first and last operations, and it's work for me on CentOS
#Check if netdata is deployed
ls -lh /usr/sbin/netdata /etc/netdata /usr/share/netdata /usr/libexec/netdata /var/cache/netdata /var/log/netdata /opt/netdata
ps -ef | grep netdata
#Uninstall Netdata
rm -Rf /usr/sbin/netdata
rm -Rf /etc/netdata
rm -Rf /usr/share/netdata
rm -Rf /usr/libexec/netdata
rm -Rf /var/cache/netdata
rm -Rf /var/log/netdata
rm -Rf /opt/netdata
userdel netdata
#Desable service and deny re enable if server reboot
service netdat status
systemctl mask netdata
systemctl disable netdata
service netdat status
#Check uninstall
ps -ef | grep netdata
ls -lh /usr/sbin/netdata /etc/netdata /usr/share/netdata /usr/libexec/netdata /var/cache/netdata /var/log/netdata /opt/netdata