What ever happened to mempool.space having the feature to help with stuck transactions ? They spoke about updates at BTC conference.
Actually it's called "Transaction Acceleration Marketplace" where you rely on mining pool to include your TX by paying them other ways. In practice, it's not really different from using ViaBTC paid acceleration service. But with more node and pool support full-RBF, you could just perform full-RBF rather than using one of these acceleration service.
It was on paper at least a bit different, as in being way cheaper than paying for accelerators as you would pay just as much as needed.
So you had a tx of 10sat/b, Foundry would include it in the next block and then they would check what tx they had to kick out to include yours and if that one was at 60sat/b you would only pay the difference, so it would be a bit superior to RBF as you would pay the minimum necessary to get in the block and the mining pool won't lose a penny either compared to ViaBTC free.
But that was how it would have worked, IF!