Officially, up to you if you believe they are following their policies, all of the companies have published statements on how long they keep their data after deletion (which customers broadly want to support recovery if something goes wrong).
- Google: active storage for "around 2 months from the time of deletion" and in backups "for up to 6 months": https://policies.google.com/technologies/retention?hl=en-US
- Meta: 90 days: https://www.meta.com/help/quest/609965707113909/
- Apple/iCloud: 30 days: https://support.apple.com/guide/icloud/delete-files-mm3b7fcd...
- Microsoft: 30-180 days: https://learn.microsoft.com/en-us/compliance/assurance/assur...
So if it ends up that they are storing data longer there can be consequences (GDPR, CCPA, FTC).