You're in France, scraping instagram for likes and saving people's names and usernames for retargeting. This is a violation of the GDPR for good measure, as the

You're in France, scraping instagram for likes and saving people's names and usernames for retargeting. This is a violation of the GDPR for good measure, as these people don't have any relationship with you or your company, it's just straight up spam. Also a breach of Facebook custom audiences T&Cs, since you don't have permission to target those user ids.