They don't even need a curated whitelist for high value domains do they? If they've seen 1 million emails from @domains.google and <.1% got flagged as spam, isn't that a good enough indicator to consider the domain a good actor?
I can understand the difficulty in judging new domains, but having established, high value, high volume domains getting their email flagged as spam is ridiculous.
It could also be anti-competitive behaviour. They want the system to be a complex, opaque, black box because then it's more important for other providers to trust their IP ranges because they're a known-good participant. If you're a small sender that wants decent deliverability your options are Google, MS, etc..
I can understand the difficulty in judging new domains, but having established, high value, high volume domains getting their email flagged as spam is ridiculous.
It could also be anti-competitive behaviour. They want the system to be a complex, opaque, black box because then it's more important for other providers to trust their IP ranges because they're a known-good participant. If you're a small sender that wants decent deliverability your options are Google, MS, etc..