https://www.techspot.com/news/82259-keeping-private-5-vpns-h...
Edit: Many coutries have mandatory data retention policies [1], so if you're from one of those countries it's virtually guaranteed that your internet usage logs for the last months/years are logged somewhere. On the otherhand, a VPN provider has a strong financial incentive to not log your data (because their repuatation has a high financial value) and in some cases it can be known that (at least at some point in the past) they weren't logging, so there is a very high probability that they are not logging now.