I did the native version of this after someone mentioned it in one of the general articles on phone addiction that have been making their rounds on HN since the start of the year. So far I don't feel like it has had much of an effect. I've only noticed two direct behavioral changes for me so far:
1) It is forcing me to wait to watch YouTube videos until I get to a computer because I want to see them in color. That seems like it should be a big gain, but I still find myself scrolling through my YouTube recommendations anyway. Habits die hard I guess.
2) It is also delaying my reading of the couple of web comics I follow since, again, I want to see them in full color.
So I guess my phone usage overall has dropped considerably since YouTube takes up most of my time. I'm already off Reddit starting a couple of months ago and I've been off of Facebook (except Messenger) and Twitter for over a year. So maybe I'm not really the target of all of this, but I definitely spend more time than I would like on YouTube.
I also made a change to my settings so that my phone screen no longer wakes up when a notification arrives. So it is less distracting when sitting on a table.
In addition I saw a couple of other pieces of advice on here to curb phone use: One of them mentioned putting only fast utility apps on your home screen and removing notifications that don't come directly from people (basically every notification except for personal e-mail, human texts, and Slack messages I guess?). I haven't tried either of those things yet but I'm definitely considering it. They both require a bit more thought and planning than simple settings changes.
In regards to the site linked, I have only one additional piece of input: Please stop with the scroll jacking. This is a well known web design anti-pattern. I don't understand why this fad has persisted as long as it has. It literally feels like the site is broken when interacting with it using a click wheel.