why does textedit keep crashing?

You are welcome.

With respect to your EtreCheck report, you appear to have multiple, so-called "cleaner" applications on your Mac, and history over the years has shown that these may present you with legitimate files (even inside an application bundle) and trick you into removing that content, which would then break the application. My recommendation is to follow the vendor's concise instructions and remove those "cleaner" category applications.

MacOS already has built-in security so you don't need to add any products for that purpose, and frequently those products also interfere with normal application and operating system behavior.

TextEdit may be continually reloading its last application state (crash), so to break that chain, launch TextEdit while holding down the shift key. Only do this immediately following a crash and not for normal TextEdit quit.