One way in which I've often thought about it is that whenever you build something on a foundation over which you have no (or little) say or control, then at least work to make it possible to be able to substitute that foundation for an alternative in the future. Or at the very least, be aware of the risks that come with such an arrangement and mitigate them appropriately.

Even beyond software or cloud-based tech, this can be useful to think about and apply even more broadly in life, for example when consideing any variety of real or virtual tools, platforms or services that you may depend on.