What's a platform: anything that only serves internal customers that is treated like a product but just isn't.
Nokia had lots of platforms. Several Linux based operating systems (meego/maemo, meltemi, and briefly Android even), several flavors of Symbian (S60, S80, S90), and several flavors of non symbian legacy proprietary platforms (S30 and S40). And that's just operating systems. And that was before MS got involved and added two flavors of Windows Phone with completely different kernels. Nokia also had UI platforms (multiple). And it dabbled with online/cloud platforms as well (OVI, if you remember that).
And indeed devops and operations platforms. I witnessed what the introduction of AWS did to those. It was hilarious. First Nokia IT was outraged that people dared to use something from Amazon, then shocked it was actually cheaper and better, and then the layoffs started and that team was one of the first things that got impacted for the obvious reason that the AWS deployment was a raging success and they tried blocking that for several years at great cost to the business. Once they were off the critical path to deploying stuff, that whole unit became redundant. They had forgotten about end users and they were pissing off their internal customers to the point that those started engineering around them.
That's the problem with internal platforms: they compete with external ones and if they aren't good enough, they become a problem. You get people digging in, add internal politics to the mix, and now you have epic amounts of money being wasted.
I think Google and Facebook are good examples of becoming serial offenders on being too absorbed by their own internal platform teams. I recognize a lot of Nokia in modern day Google. Lots of headless chickens in their leadership, endless waffle about internal platforms that then flop (fuchsia being a prime example), endless reinvention of wheels (UI frameworks, compilers, operating systems, chat protocols, social networking, IOT, LLM/AI, etc.) and a long list of stuff that they discontinue because it just didn't work, and way too many variants of just about anything they do.