AFAIK it's because you're still a newbie and sometime the forum will detect outside link as suspicious, I'm not completely remember about the detail. It's not this forum restrict CNBC, I don't think the forum restrict any site too.
Look this is the link and I can post it without any problem.
https://www.c[Suspicious link removed]m/2021/03/04/survey-finds-one-third-of-crypto-buyers-dont-know-what-theyre-doing.html
You can see that I attached 2 links, and only the one from CNBC was removed which is strange. If newbies are prohibited from using certain links, please give me the details anyone.