On: G Suite Horror Story

[Qwertie]

>(don't delete it, you don't want to risk it being re-allocated to someone else and that person accessing your recovery email on some forgotten service).

Deleted email addresses on gmail and pretty much every online service are never reusable for exactly this reason,

[crtasm → Qwertie]

Don't rely on it though. Yahoo made a large number of disused addresses available.

[catdog → Qwertie]

I really wouldn't count on that being the case. Even if it's the case now for a specific service I don't think they take as much care of those blacklists as they do of active accounts.