It is probably the greed in the big mining companies to take advantage of the current pump by clogging the mempool by not allowing any low sat fee transactions to go through into any block and taking only high sat fee transactions for confirmations. This gives the air to the greed of other small miners too, and they also set the minimum fee higher to attract high fee transactions in their blocks. We still get some chances to get our transactions confirmed but till then, we need to wait upon their mercy. Lightning Network is useful but not easy for an average guy to understand it, so those guys don't use it thinking about its complications.