Nothing at all so far.

I've been pretty careful to be polite though - the majority of my scrapers work no more than once an hour, and the few I've done that are more frequent than that don't run more than once every ten minutes (GitHub Actions can't be scheduled more often than that).

Those tend to be sites which I would expect to be able to handle the traffic very easily.

When I'm operating sites myself I don't tend to even notice a scraper that only hits a single page every few minutes. The things that hurt me are crawlers that hit every page on a site, potentially more than a request per second and with traffic patterns that are certain to hit un-cached sources.