I'm not worried about the ad supported free storage providers. On YouTube the ratio is something like 10,000 views for every 1 upload, so they amortize that storage cost across a lot of other users, not just the person who uploads it. Ratio will be lower on Facebook but even active users probably don't average more than 1 or 2 uploads per day. I've had the same gmail address for over 10 years, never delete anything, and I'm still under 50% of their free storage limit.