YouTube addon on KODI works without ads but one cannot sign in anymore so need to add and bookmark the channels one watches regularly manually. Learning to use KODI is a worthwhile pursuit these days for many IMO. Another possibility is to use the official YouTube app via a VPN with a country setting like Russia and one should see no pushed ads anymore for obvious reasons.

So your solution to see YT without ads is route it through Russia, where it will be monitored by Russian authorities?

And while on that VPN the rest of your traffic will also be routed through Russia? That's next level masochism :)