Sudo had many vulnerabilities in past some of them unpached for years and it is bloated with unnecessary functionality that increases the attack surface. Doas is more secure and minimalist for example. Not an expert to say if Ubuntu approach is correct but I appreciate their effort.

You can try and later post peertube/youtube link. Nobody can really guarantee that it will be interesting for them until they see it.

Google itself as of this moment never did put adds on a lock screen, it is the manufacturer or third party apps who can do it. Some Realme and Xiaomi phones do it afaik and probably some other brands.