“Contact your host and ask let them know about the errors. More than likely they have mod_sec enabled to limit request rates. Ask them to up the limit that you are getting 429 errors from crawlers and you do not want them.
Modsecurity cannot be disabled on shared hosting. Your plugin is making too many requests to our servers and they will be blocked because of this, we recommend using a different plugin, or just uploading your images one by one, as shared hosting upload limits cannot be altered. You can also use a VPS and set any upload limits there 🙂 “