[efishnc]

As @mplewis said, because it uses the SV API - however, I've since found a way to reduce that cost to practically 0. See https://loichovon.com/posts/streetview-scraper-v2.html

As you say though, another way to go about this would be to scrape the public SV site, which I have not attempted to do. @xnx linked this project in another comment, which seems to do just that: https://tllabs.io/google-street-view-hyperlapse-youtube-vide...

I don't know if/how they evade captchas.