This is hypocritical by David and Jason who are super political on Twitter all the time. Here's what David tweeted just a few months ago [0]:

"Imagine thinking that you have to appear apolitical to lead a company rather than simply not advocate for shitty politics, like overworking employees, putting students through hell, stealing identities on Instagram, or controlling bot armies? Anyways..."

Guess politics is only ok when it fits the ambitions of the bosses. Man does Basecamp and its leadership seem lost these days.

[0] https://twitter.com/dhh/status/1213249811538944000

You should read the blog post. It talks about this.

They only banned it on inter-office communications, not on personal social media.