Case in point
The CacheRocket WordPress plugin
The whole local performance suite ships unlocked the moment you activate it: full page caching with early advanced-cache delivery, critical image and LCP optimization, delayed JavaScript, CSS and JS minification, self-hosted fonts, LazyLoad, WebP and mobile cache variants, WooCommerce-aware caching, custom CDN rewriting, browser cache and GZIP rules, database cleanup, and remote cache warmers straight from wp-admin.
That is the feature list of a plugin people pay a yearly licence for. Here it is free, GPL, and on GitHub.
See the plugin