It's way too long for me, but just skimping I read that

1)apple was reported to the authority by meta, the authority then started investigating (and this is honestly extremely funny)

2)apple says that att prompt is enough to work as a gdpr consent form, meta didn't agree with this. The authority after a long investigation found apple was in wrongdoing because the att prompt breaks some rules on I don't understand what and so is not gdpr compliant - the only thing I understood is that it doesn't provide enough informations to the end user

3)authority also notes that this prompt was imposed by Apple without input from third parties, thus distorting the market because the same prompt is not required for apple's own apps