what is wrong with DNS name 'covid19booster.healthservice.ie' ? : Google : what is Google's secret DNS service ?

[Stephane Bortzmeyer]

On Sat, Jan 08, 2022 at 04:55:24PM +0100,
 Stephane Bortzmeyer <bortzmeyer at nic.fr> wrote 
 a message of 52 lines which said:

> This domain name seems OK for me but I notice that a fair number of
> RIPE Atlas probes in Ireland return a fake NXDOMAIN for this name:

On Twitter, an Irish DNS expert said that it happened
before. Apparently, many ISP use a blacklist without thinking and this
blacklist include legitimate domain names.