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Storing the details of a "reblog" operation in a JSON string is pretty annoying because this requires deserializing the content of the JSON string before you can analyze its contents. Even if the SQL server has JSON functions to perform such operation, this will slow down queries as the server has to process every row before being able to filter data. Unfortunately, it is not possible to create an index on values contained in the JSON string.
Moreover, the format of the JSON string of "reblog" operations has changed over time. This has to be taken into account when parsing the data. Writing an efficient query can quickly become cumbersome.
The table is a non-transactional table that enables one to know who has reblogged which post. It does not store transactions, meaning it does not expose historical data and does not allow to know when an account reblogged a post or removed the reblog.