I think it’s super important to remember that the restriction tool doesn’t really change anything when it comes to how the person restricted uses Instagram: it just means there will sometimes be a minor delay between you commenting and that comment appearing, just like if one of your blog comments got caught in a moderation queue for a bit. In terms of me and my use of restricting accounts, I'm actually fairly liberal with this tool precisely because it helps me manage my social media and doesn't change anything for readers. It might mean you said something to me I didn't know how to answer or engage with, or it might be on logistical grounds if you're commenting a lot or commenting from multiple accounts, as it helps me manage the comment section on my posts. Whatever the reason, though, it's not meant to be personal, insulting or hurtful in any way so please don't take it that way. It's just something I'm using to help me with my social media.