I honestly expect most of the big, name-brand tech companies to abide by whatever they say they do with user data and delete it when they claim they do.
100%? No, because incompetence happens. But they’re under so much scrutiny from so many players I don’t think they could get away with large-scale malfeasance. Even if they didn’t get prosecuted they couldn’t cover it up.
It’s the companies that don’t have much international presence, don’t engage in Business-to-Business, are small operations, or that dominate a sector nobody cares about that I think are much more likely to outright lie.