I assume by far left, you mean progressive on social issues, which is not really a leftist thing but the groups are related enough that I'll give you a pass.
Silicon valley techies are also not socially progressive. Read this thread or anything published by Paul Graham or any of the AI leaders for proof of that.
However most normal city people are. A large enough percent of the country that big companies that want to make money feel the need to appeal to them.
Funnily enough, what is a uniquely Silicon Valley political opinion is valuing the progress of AI over everything else