Android Users: Are you experiencing multiple unexplained app crashes today?
Here is the solution that worked for me:
https://www.reddit.com/r/techsupport/comments/mb24zj/multiple_apps_keep_crashing_on_android_phone/
^ This isn't the first time Android System Web View has borked things, IIRC.
The other solution listed in the thread which I did not try is to uninstall all updates for Chrome and disable the app. (My Chrome was already disabled.)
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^ This was NOT a permanent solution though, as Webview updated itself again and the problem returned.
What seems to be working now is this more involved procedure:
