Here are the main reasons for Google Penalization in September 2023:
Buying guest posts from spammy link vendors
Sponsored or paid links
PBNs or public link networks
User-generated spam
Image aggregator links
Hidden links
Over-optimization of anchors on inbound links
Many website owners are violating Google’s Webmaster guidelines with easy-to-detect backlink strategies.
If looking to purchase backlinks we always recommend quality over quantity when choosing your link-building company.