Concern about Nameservers
I have a concern about how nameservers and DNS records work. The thing is, let's imagine I have a domain registered and their nameservers are set to ns1, ns2 and ns3.digitalocean.com. Then, I want the content of a droplet to be shown on my registered domain, so I go to DNS > Add Domain, I write my domain name in the "Name" field, and I select my desired droplet. And voilà! Now my domain shows my droplet's content.
My question is: do I really need to be the domain owner to make this? I mean, what if someone else sees that my domain's nameservers are pointing to DO and completes the 2nd step in his/her DO account?
Is there any measure to avoid this?
Thanks in advance!