When looking at the OpenBSD Foundation list of donors, I can see Microsoft has giving a decent amount to OpenBSD over the years. I assume for use of OpenSSH. I have to give MS credit for this.

Now for a different company, IBM is completely missing and they use OpenSSH everywhere, even on AIX. And now it is even more glaring since they own Red Hat.

Yes this is a small "survey", but it shows not all large companies donates to projects that are really critical to their products.

So yes, at the very least, if your company depends upon a Open Source Project, you should throw a bit over the wall :)