Very interesting article: http://sysadmin1138.net/mt/blog/2014/11/breath-taking-honesty.shtml
Speculates that if you are working for a company like this today, you are committing career suicide in the future.
Working on closed-source software.
Working for a company that doesn't contribute to open source projects.
Working for a company that doesn't pay to present at conferences.
Working for a company that doesn't pay for continuing education.
Working for a company that has strict corporate communications rules, which prevent personal blogging on techical topics.
Working for a company with employment contracts that prohibit technical contributions to anything, anywhere that isn't the company (often hidden as the no-moonlighting rule in the employment contract).