It's always the same: you get what you pay for. No company offers something for free: If it doesn't cost anything, you're the product:

They will use usage-data to optimize their commercial offerings, they will try out features in non-critical (aka: free) accounts first - so not to offend the paying customers.

In some cases (e.g. free web-mailers like gmx, Instagram, FB etc) the free versions are mainly vehicles for advertising.

Why should Oracle be any different? I cannot see their motivation to offer anything for free... they are *only* money-driven.