But there certainly exist other wikis and wiki-like projects that dont. MDN and OWASP wiki are prominent examples that moved away from mediawiki. I think mediawiki has most of the mass-collabotation market, but there is much more competition in the open-source project documentation niche (which people often use wikis for) and corporate knowledge base market.
WikiHow is using mediawiki (or at least a fork of it) https://src.wikihow.com/
But there certainly exist other wikis and wiki-like projects that dont. MDN and OWASP wiki are prominent examples that moved away from mediawiki. I think mediawiki has most of the mass-collabotation market, but there is much more competition in the open-source project documentation niche (which people often use wikis for) and corporate knowledge base market.
P.s. for the interested, mediawiki has statistics at https://pingback.wmflabs.org/#unique-wiki-count (opt-in) and https://wikiapiary.com/wiki/Main_Page (based on web crawling)