I chose those because they are ubiquitous and downright hard to avoid. What do you want to bet OP made that post on a Chrome browser? Or an Android/iPhone/Macbook? Is there even a way to purchase a computer of any sort that doesn't involve supporting a venture backed company? The list of venture backed companies is so long, it would be exhaustive if not impossible to avoid using them without going off grid.

How many venture backed companies do you think are involved just in me pressing the "reply" button to send this post?

Sure, but that just reinforces the idea to not support them in the beginning?