Definitely if they weren't running very complex services or their business tolerated an occasional maintenance window.

The particular way Kubernetes can bite you is that it makes it much easy to start with far more complex setups - not necessarily much harder than to start with a simple setup! - but then you have to maintain and operate those complex setups forever, even if you don't need them that much.

If you're growing your team and your services, having a much bigger, more complicated toolbox for people to reach into on day 1 gives you way more chance of building expensive painful tech debt.