I'm a startup founder, and I've never understood this worry.
I know of scary few products by Google (or one of the other tech bigcos) that successfully wiped out an up-and-coming startup.
They did acquire quite a bunch, but can you name a successful Google product that killed a startup without acquiring it? I'm sure there are some but it can't be much. Docs, Android, Firebase, Maps all came out of acquisitions.
I mean, sure, they're super competitive, but my impression is that that competitiveness is mostly targeted at Amazon/AWS, Microsoft, Facebook, etc. I mean GCP is mostly just Google reimplementing the most popular AWS products with less cruft. That's super competitive but I'm curious how it threatens your one man business.