US Export Rules Hit Chip Software Companies Like Synopsys

So, get this, Synopsys, you know, the chip design software folks? They totally pulled back their financial outlooks, like, the very next day after putting them out. Wild, right? This all happened because of these new rules the US put in place about selling stuff to China. They're basically making it tough for companies like Synopsys to sell their software over there, which is a pretty big deal for them.
Their stock wasn't doing great after that, either. It was down a bit after the market closed, and it had already dropped almost 2% during the day. Synopsys even put out a statement saying they got a letter from the government, the Bureau of Industry and Security, telling them about these new export rules. They're still trying to figure out just how much this is gonna mess with their business and finances, tbh.
Apparently, the US told a bunch of companies to just stop shipping things to China without getting a special okay, and they even took back some permissions they'd already given out. This happened last week, especially for companies that make that special software for designing chips. Like, they got letters saying they need licenses now to sell to customers in China. Besides Synopsys, companies like Cadence and Siemens EDA, which is part of Siemens, got these letters too.
Siemens is saying they'll work with their customers around the globe to try and lessen the hit from these new rules. And Cadence? They filed something saying they got the memo from the government last Friday. They also said these new requirements are kinda complicated and they're talking with the government to get a clearer picture of what all this means for their business and money situation.
These new rules are probably gonna make things even more tense with China, by the way. It seems like the US is trying to stop China from getting hold of stuff they need for some important industries. Idk, what do you think this means for these companies and their future?