I haven’t either, but I also realize for me that’s survivorship bias. It must have enough issues that they’re trying to weasel this into their TOS.
I second the flat shoes, also helped my knee pain. I also like my cervical neck device, which helps move tension out of the neck and back and can help with lower back pain. Don’t forget to check your chair or your mattress, too. My philosophy is to always invest money in the things that separate me from the ground. You can also work on strengthening your TVA to help support the lower back, as well.
One of the commenters on the article claims to be a mod from the sub. They’ve been reinstated with zero communication, probably from the media pressure. And the mod-less sub starting to go up in flames.
Yet another plug for Calibre. Best I’ve found for customizing and troubleshooting PDF conversions.