Getting into conflict with big corporations (like Infineon, Microchip Technology etc.) could cost money while seizing web domains relevant to crypto (let's say domains for all exchanges) would cost them almost nothing.
It wouldn't necessarily involve a conflict: as above, it would only take a small number of compromised employees at the foundry.
In any case, many of these large corporations are clients of the intelligence services, or indeed set up by them. Take Facebook for example: I can't prove it but I'm convinced it was a spin-off from DARPAS LifeLog that was shut down on the same day (4th Feb 2004) that Facebook was founded.
https://en.wikipedia.org/wiki/DARPA_LifeLogThe presence of crypto is a good opening for the state to have some extra taxes thus they didn't not touch it hard so far, and then it just depends.
True to some extent. I'm not saying they would use supply chain attacks to destroy the network but to ultimately have some control the network, via the HW wallets.