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Access To Major Airport's Security System Offered on Dark Web for $10 (axios.com)
Researchers at McAfee found remote access to a major airport's security system available on the dark web for $10. From a report: The hacked access came from an online market for remote desktop protocol (RDP) accounts, which sell access to hacked accounts in all kinds of systems. "There's a lot of discussion about sophisticated nation-state attacks, but this was a really cheap way anyone could get access to something," Raj Samani, chief scientist at McAfee, told Axios. The RDP market isn't typically about purchasing access to systems to actually use the systems. Instead, buyers pay between $3 and $19 for access to machines based on bandwidth. Those systems are often used for their resources rather than their information.
Not sure if you're joking, but here goes:
If you don't distribute your software outside of your company (e.g. by publishing it on a webpage for the public to download, or selling it to some other companies), then you do not need to give away the source code. That is written in the GPL.
Anything compiled with GCC or clang compiler can still be kept under a closed-source license, you do not need to give the source code away.
Your lawyer is wrong.
Source: I am a lawyer.