@DJGummikuh
@unchartedworlds
There are more nuances than this, though.
First, 'public' does not equal 'okay to publicise' – the ease of access and amount of automatic visibility matters. For instance, I once spent a significant chunk of effort to get my deadname off my Wikipedia page, as it felt really uncomfortable to have it appear on the top 5 search engine results for anyone looking for my current work contact information.
Second, a regular boost is the result of someone actually thinking that the toot is worth boosting and that it is appropriate to do so. What we have here is a bot-like entity that does the boosting automatically, without any meaningful supervision.
'If it's technically possible, someone will do it' is certainly a pretty accurate description of the net. It's not a useful guideline for ethics, though.