My feeling is that they're paywalling features that are arguably better left out of these tools anyway.

When I'm reaching for Notepad, I want something that is very minimal with very low "interpretive" functionality. If I'm on Windows, I want to expect that it is there if I'm working in an unfamiliar environment and I don't want to hide the raw text as much as possible. Same with Paint. In both cases, if I want more, I'll reach for a more capable tool which excels at having the advanced features I'm looking for.