[hotpotamus]

I suspect most of the work of a password manager goes into the other features. At one point (not sure if they still do), Lastpass had a feature that could auto-rotate passwords for you for select sites. From watching it attempt it once or twice, it looked like it was done with scripted screen-scraping which must have been tedious to develop and maintain. Also providing form filling functionality seems like it took a lot of work.