Before sanctions, Huawei was the world's largest telecom equipment vendor.
After sanctions, Huawei is still the largest except they barely have any US chips in their products.
The CHIPS act has always been incredibly questionable. It seemingly goes against market forces. The US are alienating what were potentially the largest customers for all the chips they plan on making. Customers are especially scarce at the higher end processes that the US are targeting.
Global Foundries abandoned 7nm since they believed that most of their clients wouldn't be able to afford migrating to leading edge nodes. UMC barely had any clients for their 14nm process. Not even Global Foundries' contractual obligations to AMD / IBM, UMC's connection to Mediatek, and access to the latest ASML EUV machines were enough incentive for them to transition to 7nm and beyond.
The US essentially made Huawei a guaranteed customer to SMIC. EUV isn't even necessary for 7nm and 7nm isn't necessary for 5G. Intel 7 and TSMC N7, N7P are made with DUV. TSMC's 12nm was used for UNISOC's Makalu 5G modem and one of their 5G SOCs. The delay in making 5G phones might just be Huawei needing EDA tools to design a modem using SMIC's existing processes.
The way the sanctions are so gradual it's almost as if the US wants China's chip sector to undergo import substitution industrialization. It really resembles the slow ramp up of import restrictions that established the automobile industry in many countries. It's also kind of amusing that in practice it's the US that are cutting themselves off from advanced tech while China can still by the latest chips. Nvidia made the A800, and H800 just for China.. Nvidia probably lobbied to make the restriction easy to implement and based on the specification that affects performance the least.
US bans Huawei so there stuck with 4.5G marketed at 5G.
US bans DJI drones in government so they use terrible Skydio drones for search and rescue.
I'm still undecided if the hype for the 5G AI driven "Fourth Industrial Revolution" is warranted though.