When has Sony given a milestone for GT Sport? I mean a press statement like inFAMOUS SS, Bloodborne, Uncharted 4, Horizon Zero Dawn or God Of War? I didn't say they were hiding all data.
They didn't.
And they likely won't ever. Part and parcel of PR message is showcasing your success. It's presumably why Horizon's PR waited to get 2 weeks worth of sales, instead of doing first-week sales because 2 weeks would demonstrate a comparable metric to U4's first week.
GT Sport, presumably didn't get a big launch out-the-gate compared to the more front-loaded titles. And chances are sales were not better than historical GT heights. That means that on a metric-by-metric basis, GT Sport's sales would showcase an inferior PR position compared to other PR messaging.
Put it this way. if GOW2 opened at 3 million instead of 3.1 million in the first 3 days next time round, Sony might actually choose to not do a PR release on GOW2's sales, because it didn't "do better" than GOW's PR.
Even though 3mil sales is still bloody huge.
That's how PR works. You build your case to have the biggest messaging of success in the best metric possible.