https://www.statista.com/chart/18819/worldwide-market-share-...

It's not hard to imagine some customers jumping to AWS or Azure, which most large organizations are likely to already be familiar with[1] moves like this & that looming mandate causing C-level concerns since everyone knows GCP is not profitable at the current pricing but is expected to become so soon. A lot of big organizations prefer to pay a predictable amount of money than run the risk of price increases blowing their budget.

The other possibility I was thinking about is consolidation in the less popular providers — e.g. what happens if IBM sells their cloud service to Oracle or Salesforce, or a major customer switches a lot of volume to them. Oracle comes to mind since their bandwidth pricing is like an order of magnitude lower than AWS — I'm sure Zoom negotiated hefty discounts but they still picked Oracle for a reason and I'd bet it's the fact that their business is largely network egress.

1. e.g. if you use Office 365 and GCP, there is a valid argument for consolidating on a single vendor and I'd be surprised if that didn't work on a few customers since there's approximately a 0% chance that the Microsoft reps aren't going to toss some discounts around to encourage it.