url: "pkg+http://pkg.FreeBSD.org/${ABI}/quarterly"

This is the default configuration.

Not originally it wasn't. That was a change in 10.2 .

* https://forums.freebsd.org/threads/a-mini-faq-on-pkg.49694/p...

* https://lists.freebsd.org/pipermail/freebsd-ports-announce/2...

It's the default now, and 10.2 was released over three years ago. What exactly is your point?

That your configuring your system to be on these update cycles is very probably why your system is on these update cycles. This should have been abundantly clear.