Basic security question about ddns

No, not all are created equal... far from it. If ddns security is your goal, there's only one real game 'in town' ... fortunately they're also a non-USA non-profit:

root@flint:~# cat /etc/config/ddns

config ddns 'global'
        option ddns_dateformat '%F %R'
        option ddns_loglines '250'
        option ddns_rundir '/var/run/ddns'
        option ddns_logdir '/var/log/ddns'
        option use_curl '1'

config service 'desec_ipv4'
        option interface 'wan'
        option service_name 'desec.io'
        option lookup_host '$myDomainHere.dedyn.io'
        option domain '$myDomainHere.dedyn.io'
        option username '$myUserNameHere.dedyn.io'
        option password '$myPasswordHere'
        option ip_source 'web'
        option use_https '1'
        option ip_url 'https://checkipv4.dedyn.io/'
        option enabled '1'
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