All big corps have strings attached on their free stuff, just like they don't contribute to FOSS out of the kindness of their hearts on the management board.
Free offerings from different corps are not equal in their concerns. With Google, my concern is they simply kill or abandon their project. With Oracle, I have to worry about lawyers knocking down my door for a license audit
Google, like other hyperscalers, has some nice surprises on GCP bills, when things go beyond the free to play.
They can also kill someone's business, that depends on those products, or forbid them to use Play Store with similar outcome, even though Android development is mostly free.