There is more to it than just the crowd think aspect. There are certain limitations imposed upon members of the intelligence community that do not exist in the open community. Due to the problems of handling classified intelligence, the risk of moles compromising sensitive intelligence and agents, and the need to compartmentalize the intelligence and analysis; there are often situations where intelligence available from open sources does not come to the attention of the intelligence analysts. Even when the open source intelligence does come to the attention of the intelligence analyst, they are often denied the opportunity to include it in an intelligence analysis, communicate the intelligence to other analysts, or act upon the open source intelligence.
In one real world example, an open source publication presented some information about the Soviets deploying some improved anti-aircraft AFV (armored fighting vehicles), but the intelligence officers of a military unit tasked with the job of suppressing this surface-to-air threat were not allowed to read the article or publication, disseminate the information in the article, or use the information found in the article in their own intelligence analysis or tactical doctrine.
The person working with only open sources faces a disadvantage having no access to classified intelligence, but also has the advantage of not being confined to sources and methods that must be safeguarded with counter-intelligence procedures.
Some intelligence analysts do have access and opportunity to use open source and classified intelligence, but they always face the problem and limitation where the use of the open source could inadvertently also compromise a classified source. To avoid such eventualities, the intelligence analyst may have to censor the open source to avoid problems with the classified sources.
I’d say its probable that more times than not a crowd sourced cloud of analysts would end up compromising a brick and mortar source. But there’s some safety in anonymity. The bad guys won’t know which guess was the right one.