I’m not gravely irked by it, but it does sometimes distract you from the content of the blog post you just read. Similar to “you might also be interested in […]” footers and the like. I’d prefer writings to not be bookended or interrupted by stuff that isn’t directly related to the contents of the article, as to not distract one’s flow of thought from the reading.
If I want to donate, I’d look at the blog’s About page. Placing it on every article page does come across to some extent as trying to increase donations.
These "buy me a coffee" buttons make me feel guilty, similar to being shamed into tipping. I'll make a buy/don't decision when I see the cost upfront. Everyone makes choices on how they earn their living, I'm just saying these things make me uncomfortable and I wish there was a better way.
If I want to donate, I’d look at the blog’s About page. Placing it on every article page does come across to some extent as trying to increase donations.