While we are at it, looks like spotify.com is using a mix of NS1 and GCP for DNS.
spotify.com. 172800 IN NS dns1.p07.nsone.net.
spotify.com. 172800 IN NS dns2.p07.nsone.net.
spotify.com. 172800 IN NS dns3.p07.nsone.net.
spotify.com. 172800 IN NS dns4.p07.nsone.net.
spotify.com. 172800 IN NS ns-cloud-a1.googledomains.com.
spotify.com. 172800 IN NS ns-cloud-a2.googledomains.com.
spotify.com. 172800 IN NS ns-cloud-a3.googledomains.com.
spotify.com. 172800 IN NS ns-cloud-a4.googledomains.com.