In this situation might be helpful various different adds and software. A lot of people are using it to block annoying advertisements and also to avoid spam. I find this great method really effective.
How to block ads on Youtube?
YouTube or any others websites are having a bunch of various problems with ads. These ads are coming from nowhere and you can't control it. That is why I suggest to download a special tool that will be helping to control viruses and to block various ads. For this reason, you can read more about it and https://adlock.com/blog/how-to-get-rid-of-calendar-viruses/ is a really effective article where you can read more about it.
How to block ads on Youtube?
How to block ads on Youtube?