I use Firefox for my browser, and I have AdBlocker Ultimate and uBlock Origin. All ads get blocked. Just be careful of ad blockers who decide to whitelist for money. So basically what this is, is an adblocker will exist, and the team or company behind it will be offered money to whitelist websites so that their ads show up, in other words, it makes the adblocker defective and you have to go search for a new ad blocker that doesn't whitelist and just blocks all ads.
As far as ads that are in the video, I just skip over them. I think some youtubers are doing this because my guess is ad blocking doesn't bring in the ads for them, but if a youtuber gets sponsored by a company, that youtuber will be paid so much money from the company if they mention them in the video.
And I won't pay for youtube premium either. It's a complete waste of money to pay for youtube premium.