The rule is simple. Google is fine for anything not in the critical path.
Need something to spread on social media? Fine. Post on Twitter, Facebook, Google, go nuts.
Never use Google (or other sketchy vendors) for anything you need to rely on to be there tomorrow.
Example: Youtube is fine for promotional materials. If you run an ed-tech and need videos to be there for students (core business), pay for something which works.
Example: Running a Black Friday promotion? Adwords. Relying on Google SEO for your main business as the main way to recruit customers? Bad idea.
You get one exception to this if you're building a Google-centric business. Is your business an Android App? You obviously get to use Android in your core business. If your business a Youtube channel? You get to use Youtube.
Things like Google Workspace, Google Cloud Platform, etc. are out. If, tomorrow, Google decides to wipe all you Google Workspace data (yes, it did this to a startup I was involved with), you're DOA. Office 365 is annoying compared to Google Workspace, but still worth it, since Microsoft won't wipe out your business as a statistic.
The way I think about this is each business has risks which multiply out:
(failed to execute technically) * (odds of market fit failing) * (odds of not being defrauded by your co-founder) * ....
This should multiply out to how likely your startup is to succeed. The way exponentials work, most of those risks need to be very, very low. You get one, maybe two, big ones. Every Google product in the core critical path has perhaps 10% odds of wiping out your business. Adopting Android is totally worth it if your business is Pokemon Go, but for most aspects of your business, pick trustworthy vendors.