In the October 2022 Google SEO Office Hours, someone mentioned how every week, they run a noindex tag addition program over their pages with no traffic. He asked if this has an effect in SEO due to the continuous increase of noindex pages over time. His goal for doing this is to get new content crawled and indexed faster rather than wasting his crawl budget on no traffic pages.
Lizzi Sassman responded that noindexing pages won’t really help in optimizing the crawl budget for a site. This is because in order to find the noindex tag, Google needs to crawl the page and that uses crawl budget. The only way to control the crawling of a site is with the robots.txt.
The number noindex pages also does not affect the overall SEO or ranking of a site.
If the goal for the noindex is to remove low quality content, then noindex can do that but you can also just remove the low quality page directly, rather than setting them as noindex.
Check out the SEO Office Hours October Episode here.