Too Long; Didn't Read
Increased activity on the Ethereum blockchain in mid-2020 caused a slowdown of the network, which in turn caused increasing transaction fees. The proposed solution was to increase the gas limit to 12,500,000 in order to cause more capacity, which was voted upon and passed by the mining community. But it's not just as simple as resetting the limit, because while it may play out well for some in the community, it may mean the end for some node operators. The debate is similar to the one Bitcoin faced in 2017 that led to its first contentious hard fork.