You are impaling that the companies would ignore the GPL but you had not mention why do you suspect this, do you have a case in mind where this happened?

I have no doubt that plenty of companies would comply with the GPL happily and would want to both as companies and individuals.

Given something like a mobile OS, I'm concerned other pressures / motives would come into play.

I don't think any given good behavior means anything.

Why would the mobile OS be different? If you sell hardware you don't want to make money from selling licenses and handling the support for a mobile OS. As a hardware company I would prefer the OS to be open source and have the patches mainlined into the kernel if possible.

What I dislike in this topics is the fact US people will assume the worst about a thing if is somehow related to China, there is nothing suggesting that Huawei would not respect GPL.

Huawei had a pretty bad track record publishing their modified Linux kernel sources. They got better in recent years and created https://consumer.huawei.com/en/opensource/detail/?siteCode=w... but many older devices aren't listed.

I think they'll be more careful to comply with open-source licenses in the future, but there's precedent to show that they don't care all that much if they can get away with it.