Bender parent
I park mine by having no IP address, MX record is "0 ." meaning it does not receive email, the SPF record is "v=spf1 -all" and DMARC is a strict reject, CAA is 0 issue ";", BIMI is "v=BIMI1; l=; a=;". I do the same for wildcard DNS. There's probably more I should add.
Indeed, this is a common practice in the broader data. It seems the linked article is filtering to resolvable+hosted domains, a subset of overall domain parking.
Yup. That's why I am suggesting to stop that practice and just remove the IP rather than trusting the landing page someone else maintains. Or if one would like to give bots something to do point it to a multicast address or perhaps MoD/US Military address.
The m3aawg has a parked domain guide - https://www.m3aawg.org/sites/default/files/m3aawg_parked_dom...
I appreciate that but I will always follow the Bender Domain Parking Standard [1].
[1] - https://mirror.newsdump.org/domain_parking_standard.txt