There's an encrypted mode but it's missing many features and in my experience most people use it rarely or never. The default mode is not e2e encrypted.
It uses standard transport encryption for all communication. End to End encryption is available for direct messages. It isn't used for groups, where real E2E is very difficult and complex and AFAIK nobody does it well, and channels, where it doesn't seem to have much point.
Sorry, my comment was tongue-in-cheek. If revenue is defined as income from operations, having to pay people to use your product could be considered negative income, aka negative revenue (even if that's not how that actually works). I guess it was a bad joke if I have to explain it.
From what I understand the reason why YC is offering this Advisor Edition classes is to get these non-YC alum advisers ready for the regular version of the YC Startup school.
Last year YC accepted everyone into YC startup school (due to a Boolean error) and a lot of groups ended up participating without an adviser. And you get the best experience when someone actually guides you every week.
This year YC will again open the YC Startup School for everyone and YC can't scale it without having trained advisers.
Finally, I wouldn't worry too much about "advisers without experience." YC is smart enough to filter out bad apples from the bag.
Our Android developer silently inserted cryptocurrency mining code into the new release, pushed the clean version to github, but submitted the infected version to Google Play.
After a few weeks Google caught that and banned our app. We lost thousands of customers and years of work and had to start over with a brand new app. Years later the infected app is still mining cryptocurrency because users ignore Google’s malware warning message and keep using the app.
PS: I should have said “our FORMER Android developer.”