Americoids and Grammarly. Sigh.
I unconsciously took it for granted that I have a bigger vocabulary than the spell-checker. Didn't even occur to me that I might not know more about spelling than the programs do. Have to add stuff to their dictionaries all the time.
Likewise I'm going to have a broader grasp of grammar than the grammar-checker. Especially a free one. It's going to be worth at most what you pay for it.
Result: Grammarly is actively degrading the prose of those who use it. Pretty sure I'm picking up Grammarly-specific solecisms. Tells, if you will. I could verify by using it myself, but look: I already know I'm right. The conclusion is already safely supported. The details don't matter.
Likewise Strunk and White were hacks. Folk with good grammar display it by writing, not by telling you about it. Every grammar book ever has been an attempt - generally successful - to impose twisted wrong grammar on desperate middle-class insecurities. For Impact reasons. E.g. it was just normal to use "they" as a neutral singular until this one grammar book in the 1800s. It was that one guy who made it 'he' instead, and look what the result was. Morons.
They signal virtue precisely because you won't find any if they don't signal it. Attempting to order back the tides.