The trees obscure the forest
A summary:
Ways to insert data:
1) OP_RETURN outputs (“nulldata”)
You put the bytes in a non-spendable output (scriptPubKey starting with OP_RETURN).
Advantage...
You can hide arbitrary data in a facebook image. But people will not know it's there until extraction is explained. Then it becomes a problem. As Satoshi said, putting plain text in bitcoin is an accident waiting to happen. Few.
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