I would probably agree with you that attaining evidence of this spying would be somewhat easier for governments than for others. However, the rest of your assertion that these accusations are only due to geopolitics is pretty out there given it's almost universal at this point that people think Huawei are not on the up and up.
Hurtling accusations without any sort of supporting evidence is literally what you've just done. There's a ton of evidence out there to not use them.
Here are some pieces of evidence for you that literally were on page 1 and 2 of a search:
CIA, NSA, FBI just last year saying the US shouldn't use them: https://www.forbes.com/sites/marcochiappetta/2018/11/25/u-s-...
At least the US and Australian Intelligence services have hard evidence of them spying for the Chinese government: https://www.axios.com/report-australian-intelligence-know-hu... https://www.reuters.com/article/us-huawei-security/former-ci...