If you ask this question then the answer is no, however, you probably can't build a startup in any language as you're too worried about what everyone else is do

If you ask this question then the answer is no, however, you probably can't build a startup in any language as you're too worried about what everyone else is doing rather than what your customers want. Seriously think about a young mark zuckerberg making facemash and worrying whether it could be a $100 billion dollar company if he wrote it in PHP. If anyone worries about these things just change your server headers so it looks like you're developing in whatever language they want. Its usually a good idea to change the headers anyway so that any automated attacks run the wrong scripts. Change your postfix to Exchange, change your nginx to IIS and vice versa.