‘personal data’ means any information relating to an identified or identifiable natural person (‘data subject’); an identifiable natural person is one who can be identified, directly or indirectly.
The keyword here is indirectly.
Australia: https://www.legislation.gov.au/Details/C2019C00025
personal information means information or an opinion about an identified individual, or an individual who is reasonably identifiable.
(a) whether the information or opinion is true or not; and (b) whether the information or opinion is recorded in a material form or not.
The keyword here "reasonably identifiable".
So if the purpose of an email hash is to identify me for ads targeting, then it is by definition reasonably identifying me, even if indirectly.
‘personal data’ means any information relating to an identified or identifiable natural person (‘data subject’); an identifiable natural person is one who can be identified, directly or indirectly.
The keyword here is indirectly.
Australia: https://www.legislation.gov.au/Details/C2019C00025
personal information means information or an opinion about an identified individual, or an individual who is reasonably identifiable.
(a) whether the information or opinion is true or not; and (b) whether the information or opinion is recorded in a material form or not.
The keyword here "reasonably identifiable".
So if the purpose of an email hash is to identify me for ads targeting, then it is by definition reasonably identifying me, even if indirectly.