From about 2015 to 2017, the Bitcoin world fought over whether to make blocks much bigger. Users who wanted small blocks, so regular people could keep running nodes, won.
Go deeperBig-block supporters, including major companies and miners, wanted bigger blocks for more transactions. Small-block supporters added capacity with SegWit instead, which activated in August 2017 after users pushed with a "user-activated soft fork" (BIP 148). Big-blockers split off and created Bitcoin Cash. A later company-backed plan, SegWit2x, was called off. It proved that users running nodes, not companies or miners, set Bitcoin's rules.