Hi. For clarity and transparency I'll try to put this into simple words:

1. Amazon's CloudFront is just storing scripts, we could embed them ourselves and we will. (we have a small technical thing to overcome before we do this in a proper way) So yay for script blocking users. :P
[edit: there is no CloudFront hosted script right now]

2. We don't send anything to Amazon. The script hosted there (by opbeat itself) is angular-opbeat and it's used by us to collect erros in JavaScript on the user side, alert us etc. - it's created also to be helpful in debugging performance issues on users side. The data is sent to opbeat servers. So the aim in including the opbeat (or other services in future) is:
- Instantly know about site crashes on your side, even if you're in a small group of users or have the issue individually
- Make our website faster for you

3. You can block google analytics and opbeat on your side, we're prepared for that and we respect it - and you'll be able to use our website without this particular amazon-hosted script soon (can't say when, I'm sorry).
[edit: it's done]

You can read the discussion starting from this post (a few pages of related and unrelated posts):
https://www.gog.com/forum/general/the_what_did_just_break_thread/page75#p_b_1504

You could just look into the network panel in your browser and see exactly what is sent where.

For now - aside of Google Analytics, there's only sending encountered JavaScript errors data. I've prepared one myself so I can attach it to this post.

I've prepared a special script for your user ID. Nice new t-shirt you have there.

We'll get AF/BE errors only if they happen to be inside of angular's $apply or cause our code to crash. I was wondering one day to create a simple AF/BE detection and either ignore those, or send as additional info. ;) Didn't do it.

I never wrote that there is no chance - I wrote the opposite, but we don't want to remove things without thinking like crazy people. :P

btw - it's removed.