Sentry's sales team is incredibly aggressive. I've seen multiple colleagues hijacked for sales presentations over a few months. It would not surprise me at all if they just asked random employees to be added to the company slack, and even less if those people then just did it.
I can only commend the hustle on their part, but it does feel a little like a high pressure time share situation.
If you - or anyone reading this - ever ends up in a situation where we came off as aggressive send me a direct email and I will take care of it. This is not something we believe in at Sentry, and while you cant manage everything, its important to us that we never become "of those companies" like so many other successful companies become.
david at sentry.io