Mostly the VC-backed web stuff, where folks coming from the web don't seem to understand that explicitly and unnecessarily contacting a server to push analytics is very different than recording the requests that web browsers make by virtue of their operation.
Ever see that questions when you first start your phone, or MS office, or Google Chrome, or OS that's like 'Over time we like to collect anonymous diagnostics and usage information. Yes or no?'
When it's done by software running on hardware you control, it has to consult your hosts file and your iptables and your proxies and your routers. Ultimately it can't do anything you don't let it. You don't have to opt-in to paying attention to the connections each program makes, but you also don't have to willfully ignore them.
If you care about that sort of situational awareness, there are tools like Little Snitch that make it easier.