I am a software engineer but I'm not a blockchain engineer. There are many on here, however, who are; these people may be able to explain what I just attempted to in a better way, but that was my best attempt at explaining things how I understand them.
Twetch is utilizing this OP RETURN field to store the content from a twetch post when one is made. This is how data is stored on the block chain. And this is how, if twetch were you ban you, any other company who knew how to, could point at ...
Once you navigate to this screen, you could scroll down to where you see 'OP RETURN' mentioned. Click Twetch Post button the write to expand the section. You can think of this OP RETURN section as a comment field in every bitcoin transaction.
Click on the 3 dots in the top right corner of any twetch post you see. And click Blockchain Transaction. This will take you to the public (bitcoin sv) blockchain where you can see where the data from that twetch post is being stored
You can't be banned from the blockchain. Only the the company hosting the front end of the site. So there could always be competitors who could create a competing platform that uses the same back end blockchain for it's data.
Twetch could ban a user, but the user's content has been permanently stored to the public blockchain. So for example, any other group could create a different front end to connect to the blockchain (back end) to display the banned user's content.
No worries bro. You can keep it. I was just quickly paying people today and I wasn't keeping track of who I had already paid, etc. So It was bound to happen. Cheers! :)