How can I confirm if I've been blocked on iMessage?

There is no method to determine If someone has blocked you.

You're right that determining whether you've been blocked by someone on various messaging platforms can be challenging and often inconclusive. While some platforms might give certain indicators that someone has blocked you, these indicators are not foolproof and can sometimes be misleading. Here are a few reasons why it's difficult to definitively know when you've been blocked:

1. Messaging apps typically don't explicitly notify users when they've been blocked. Instead, they might provide subtle cues like messages not being delivered or a lack of online status updates.
2. People's online behavior can vary for reasons beyond blocking. They might not be active on the platform, have notifications turned off, or simply haven't seen your message.
3. Different messaging platforms might have different behaviors when someone blocks you, leading to inconsistencies in how you perceive the block.
4. People may choose not to interact with others for a variety of reasons unrelated to blocking, such as taking a break from the platform, dealing with personal matters, or changing their communication habits.

Because of these complexities, it's indeed challenging to definitively determine if you've been blocked. Jumping to conclusions based on these uncertain indicators can lead to misunderstandings and unnecessary frustration. It's often better to approach such situations with a balanced perspective, consider other possibilities, and try to maintain open lines of communication through various channels if possible.

Remember that healthy communication is key, and if you're unsure about someone's intentions, it's always a good idea to communicate openly and honestly with them to avoid unnecessary assumptions and misunderstandings.

You don't.