since YouTube started annoying us with their “disable ad blocker” thing, I managed to get rid of it by uBlock Origin and a Tampermonkey script. Yet, the stupid popup is back. To everyone who's gotten rid of it until now: What did you do? Can you point me to the resources you used? It's annoying!
I just use uBlock Origin (without any additional scripts) and whenever it stops working I update the filter lists manually (it updates them automatically every now and then).
Not using the default ones is a probable cause for why your browser gets flagged. Restore to default settings and make sure you don't have other adblockers enabled (such as the one built into YouTube Enhancer add-on) If you still get the pop-up you can update the "quick fixes" list or wait an hour or so for the uBlock team to catch up with Google's latest updates to the detection script.
"No need to waste time with scripts and stuff.", you mean other than learning and knowing what the script does as opposed to hoping the apps' developers are honest, never die, and never sell out.
It's all FOSS. Whoever gets doubts about the devs can check the source or have it checked by experts. They sell out or die? Switch to other frontends or forks. I'd never trust any dev blindly, but if I can choose between these ones and Google... well.
Not everyone has the time, energy, or even the knowledge needed to understand what the scripts do. I think most internet users don't even know what is a function and how it looks like, and they don't want to change after getting home from the 8 or more hour work and still needing to do house chores, bills and whatever.
Just use a Invidious instance. Don't even bother with YouTube. You can use an RSS feed reader to port your subscriptions, then use a redirection extension to bring you to the invidious version of the channel.
If you're so inclined, you can download the video using yt-dlp which you can use to download videos from invidious and even pass a sponsor block flag which integrates with the sponsor block api.
On mobile, if you have Android, you can use Tubular. You can request from Google to give you your subscriptions as a fifle that you can upload to these apps. Tubular also uses Sponsor block as well.
Lastly, if you're on iOS, the best I've found is simply to use the Brave browser.
Updating your filter lists in uBlock Origin should fix it. Nevertheless, there are better solution for watching YouTube videos without Google's crappy ads and trackers. There are private frontends like Piped and Invidious, you can use LibRedirect to automatically redirect all YouTube links to your desired frontend. You can also use a native client like FreeTube on Desktop, LibreTube or Tubular/NewPipe on Android, Yattee with this guide on iOS, iPadOS and tvOS, SmartTube on Android TV or this app if you have an LG TV running webOS.
I set my user agent to the Google bot for youtube. It seems to work last time they pulled this shit. The only down side is that it forces desktop view if on mobile.
I did have problems using YouTube many months ago, but I tried to watch a few videos each day and after a few days things started working normally again.
God damn, please remove these pesky ?utm_ parameters from your links. They make your links unnecessarily long and your comment becomes pretty annoying to read. You don't even have to do it yourself, just click on "Copy Link Without Site Tracking" in Firefox. Make it a habit to always use this option. If you don't want to deal with it at all, install the ClearURLs addon or enable the "AdGuard URL Tracking Protection" list in uBlock Origin.
Those URLs came from about:addons. I think it's important to provide as much provenance as I can to help people get programs, so I didn't edit the URL Firefox provided to me.