Youtube has been overwhelmed with plenty of advertisements during videos these days. They've increased it so badly, they're likely trying to annoy users into subscribing to Youtube Premium, a $12/mo subscription service that also comes with Youtube Music. It's up to you whether you want to bite their lure, but you can also block ads at the DNS level via NextDNS. If you have an Android phone, Firefox Focus works as an ad blocker and can possibly filter out Youtube commercials. Give it a try!