> People can license their software however they want, but it is worth reflecting on why almost all open source authors go with a permissive license like MIT: because it is basically a "buyer's market." When choosing a database, distributed queue, blogging platform, or whatever, companies usually have a choice of at least several high quality open source options.

> If one of those options places restrictions on the users, then those users are probably going to choose one of the other options.

First, if someone isn’t paying, he’s not buying. ‘Paying’ should be understood broadly, e.g. code as well as money counts. A company paying dollars really doesn’t care that much about the license — plenty of companies pay for proprietarily-licensed products (even ridiculously limited ones, with dongles and high seat prices). OTOH, a company ‘paying’ with code contributions should prefer the GPL, because it knows that its contributions will never be taken away from it.

Second, the GPL does not restrict users; it restricts developers from restricting users.

The GPL family is the right way for individuals and companies to form a software commons in which all can benefit.