_Mempool Policy_ limits some fields. For example transactions above 100,000 vB are considered non-standard and will not get admitted to nodes’ mempools.

_Consensus Rules_ are very lenient to transactions, it has e.g., always been valid to fill the entire block with a single transaction, or even just a single output script (although output scripts over 10,000 bytes are unspendable).

Is that the only bound on data storage? I thought some fields had maximum values.

Undisciplined

Do you mean expand the block size limit? I don't think I'd run that.