Some instances of people asking about GNU Affero GPLv3 and RethinkDB:
For the record, I personally think that this is 100% pure FUD (the thinking behind it is described as "preposterous" later in the thread). Nevertheless, if someone with the title of "Sr. Director Of Open Source, Open Standards" at a company the size of Yahoo can buy in to this FUD, then most smaller companies have no chance of distinguishing between fact and fantasy, and many will steer clear as a precaution.
I realize every hacker on the planet feels that they have the finer points of AGPL interpretation under firm mastery and are in a position to explain contract and licensing law to lawyers, but a vast number of lawyers at the large shops have looked at AGPL now and advised caution in dealing with it nearly across the board. If you want to characterize that as "unfounded doubt" (which I've translated to FUD for you instead of pressing you on what "unfounded" means without precedent), you're not technically wrong, but it polarizes what is otherwise a reasonable position of uncertainty on a significant amount of corporate risk. There are people who spend their entire lives managing risk, and hackers are very quick to dismiss such concerns -- even beyond AGPL, a number of various risks could rapidly unravel an entire corporation, and I'm often in conversations where the solution seems obvious to an engineer.
The term FUD itself is dangerous, because very often uncertainty is a perfectly valid approach to a legal problem such as licensing. Belittling uncertainty by equating it to fear creates the flawed impression that we should all act rashly all the time. Sometimes caution is good, even if it's the other side of a debate you feel passionately about, and polarizing it will not help you win over the cautious folks. Understanding their concerns and meeting them at the table will go much further.
Knocking open source groups at large shops with scare quotes like that is a bit weird, too. So Yahoo! starts an open source team, speaks openly about their thinking around licenses, generally invests a lot of thinking in license compliance and how to contribute back (Yahoo! is one of the bigger contributors to FOSS that I can think of -- hello, Hadoop?), and then after all that, free software advocates make comments like this one and cast some aspect of the work as hostile to free software. That seems self-defeating to me and I wish this whole conversation were less polarized, given that most companies don't even have an "Open Source Intern."
This is not uncommon in the industry. To preempt that this attitude entails a hatred of free software or GPL-style licenses, I should point out that the same legal teams often approve GPLv3 software (which can be equally contentious).