Mixed feelings about that equivalency. On the one hand, Sabina definitely has a point in that chastity belts are most commonly marketed as sex toys themselves, much like the other items she tried out. Using restraints as tools for disciplining your sons, daughters and non-binary offspring/wards is very much not accepted by mainstream society in most western countries, and as a result, regular use of chastity belts would be frowned upon as inappropriate by most outsiders, and those who have the faintest idea of what most chastity belts are marketed as will likely view it as perversion unless they are doing similar things. Its relationship to conservative values can also be called into question: Taking measures to avoid premarital sex is of course completely in line, but the means to enforce them are a different issue. While some families may have an internal tradition in using them, very few of them would casually discuss it with outsiders without first gauging their reaction.
On the other hand, Ines has a point that ultimately, a chastity belt is a tool and its purpose is decided by the user. Just like a sharp knife can be used to build things, to cut your food or to threaten a person, a chastity belt can be used to support a commitment, for play between consenting partners or to abuse a person's body. That does not make the device good or bad, just the use. And under this point of view, it could be argued that using a chastity belt to prevent sexual missteps is less of a sex act than using items that are only in the house because they were bought for sex play.
Ultimately, I do not think there is a clear answer to that question and that people have to come up with their own answers. Not in the sense that anything goes - I still believe using BDSM-centered views (talking about "liking the experience of enslavement" and such) on a parent-daughter dynamic crosses a line. But where exactly that line is drawn is very difficult to judge, and ultimately that is a major reason why we should err on the side of caution when confronting the general public with any form of chastity arrangement - it may be "not a sex toy" (or "more than a sex toy") to us, but what it is to them is a different question.
