I don't think there is a valid alternative to YouTube, but I've found bookmarking creators instead of subscribing with an account to be a fine way to enjoy some content without having it tied to your Google account. It's not perfect though. Perhaps Patreon can partly fill that niche instead?

I just started using Odysee(based on/connected with lbry) and I must say while it obviously doesn't compete in terms of content and the front page suggests it's a popular location for conspiracy nuts you can actually find a lot of well-known YouTube channels on there.

In fact I'm pretty certain that if this continues it'll be able to compete with YouTube in the long run; mainly because content creators can just upload everything to both platforms for a chance to reach a larger audience and at the same time have a "backup" in case Google bans their account for a random reason. I've seen multiple channels either moving completely to lbry or just mentioning it in their YouTube videos with the hint that the other platform also has their videos but without ads. Considering YouTube has a terrible reputation when it comes to their weird content filtering, monetization rules and completely broken copyright strike system it might not need a huge push to get some momentum.

I am happy enough using ProtonMail and calendar, Duck Duck Go, and Apple services. But, I use tons of Google services that I pay for: Youtube Premium via Youtube Music, Google Photos (pay for extra storage), books, GCP. I like being able to search Google Photos, and that is one killer feature that Apple Photos does not have (my iPhone automatically uploads all pictures to both, as well as OneDrive). As individuals, we all need to decide where to draw the line re: privacy. I found a setup that I am comfortable with.

As an app for browsing content exclusively available on YouTube, I use NewPipe on a FOSS build of Android and am fairly happy with it. It does subscriptions (channel bookmarks, basically) without requiring a login, and that's plenty good enough for me.

As far as a video sharing platform, I don't think there's anything with quite the flood of content, since YouTube is such a household name. I'm looking into running a PeerTube instance as an alternative to stuff I want to publish, so I'm not at risk of Google pulling my plug randomly, but I'm also not looking to make money with any of my videos. My limited personal utility will be easily met by a far inferior platform.

I believe there is a Firefox plugin that redirects to invidious but I don’t have enough experience with it (yet) to include it in my blog post. Also I have found it to be a bit of a hit or a miss.

YouTube is the only Google service that I still use and I think that’s fine.

Once you have everything else replaced, paying for YouTube premium and using it like Netflix is a good model.

I wouldn’t put personal videos up there, and if you’re a creator you should double post to YouTube and somewhere else in case your account is killed.

An Invidious instance is a good solution.

Of comparable breadth and depth, there isn't one unfortunately.