There is no more complex locking mechanism, it is based on the number of requests, on cookies, on session support, analysis of jumps on the page, analysis of content loading when loading the page, etc., i.e. from the same machine you will be able to enter the site with your browser and the script will receive a captcha.Their detection of scrapers is probably linked to the amount of requests generated by a mass-import on new or refresh of existing collection.