The push against Huawei started in Australia as we started to deploy 5G. Our government essentially banned our telcos from installing Huawei equipment.
The UK had set up a different approach where Huawei exposed their entire stack to UK security authority scrutiny.
The "Five Eyes" security alliance (US/CA/UK/AU/NZ) basically then decided that they didn't want Huawei "inside" the 5G network, partially because of oversold promises of what 5G would enable.
There is a new "cold war" between the US (and the "West") and China and a realignment of alliances since the 2nd term of Xi began and he started rolling back the opening up of China's economy.
This has accelerated after the crack down in Hong Kong and the sabre rattling about Taiwan.
They might be right, but it's super hard to determine where good intentions stop and self interest starts.