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TLDR: Android 15 is going to keep the Android System Webview ram-resident at pretty much all times so that when an app needs a "web popup page" it will load significantly faster.
Here is an article from Android Central detailing how the component works at relatively high level.
Apps like hermit should benefit immensely from this. But, this will also mean reduced free ram for other apps. Fortunately, the increased ram of today's smartphones should make this negligible.