- Google Docs suite - easy, probably requires less than $10M to duplicate the entire set of functionality, including all the enterprise and reporting features
- Gmail - same
- Google Search (classic, not LLM-answers) - probably easy to do now, the challenge is getting past Cloudflare
- Android - vibe coded hardware is coming, but we're probably 5ish years out.
- YouTube - probably one of the hardest, due to network effects / distribution
- GCP - hardest, due to the infra build out. But neoclouds are rapidly growing.
I can't think of anything most big tech companies do that won't be put under threat in the era of personal software and rapid development.
It's ironic that Google invented the transformer and it seems likely that it will undo the empire they've built as well as all of the moats in the world that aren't distribution / community based.