This is the DNS records expiring rather than the domain. On most providers DNS records are provided for free as part of having other services (eg a VM) so there

This is the DNS records expiring rather than the domain. On most providers DNS records are provided for free as part of having other services (eg a VM) so there is no incentive for the provider to nag you about your DNS records expiring. They are very likely to nag you about your VM expiring without mentioning the DNS records.