It was a social test.
I don't get how was this a social test.
I'm very interested in the results, please share it.
BTC sent at low cost was approved today after 3 months.

At the very least, you've successfully performed an experiment that even with the default of 14days mempoolexpiry policy,
some nodes will still keep a would've dropped transaction in their mempool that will eventually be relayed to miners in the right network conditions.