Oh, have you seen tweets from Basecamp leaders calling people out? you could actually say that the execs are activists as well based on their posts on social media.
Not really sure where I sit on the whole thing, still, but I've seen this parroted as a "gotcha!" and I don't think it really is. The founders' activism is _public_. The ban is only on activism _at work_. The fact that so many people don't _get this_ is sort of proving their point.
That's not the case. They're explicitly saying employees are welcome to discuss the founder's activist preferences at work. They've also heavily used their workplace for activism. For example, they invited a political candidate to base a campaign out of their offices.
Yes, on social media. Outside of their basecamp account.