If you are bothered by comment spam, but don’t like to annoy your visitors with captcha’s give Antispam Bee a try. It detects most spam and deals with it automatically, without depending on third party services or cookies, and is therefore very privacy oriented and GDPR compliant.
Extract from WordPress.org
Say Goodbye to comment spam on your WordPress blog or website. Antispam Bee blocks spam comments and trackbacks effectively, without captchas and without sending personal information to third party services. It is free of charge, ad-free and 100% GDPR compliant.https://wordpress.org/plugins/antispam-bee/