to quote the article (or rather, the 2023 article which is the one mentioning the number 3).
"Somehow, a couple of weeks ago, I found this other site which claimed to be better than LE and which used relatively simple HTTP requests without a bunch of funny data types."
"This is when the fine print finally appeared. This service only lets you mint 90 day certificates on the free tier. Also, you can only do three of them. Then you're done. 270 days for one domain or 3 domains for 90 days, and then you're screwed. Isn't that great? "
"Somehow, a couple of weeks ago, I found this other site which claimed to be better than LE and which used relatively simple HTTP requests without a bunch of funny data types."
"This is when the fine print finally appeared. This service only lets you mint 90 day certificates on the free tier. Also, you can only do three of them. Then you're done. 270 days for one domain or 3 domains for 90 days, and then you're screwed. Isn't that great? "
She don't mention what this "other site" is.