YouTube and Instagram already have identical features. Most US creators who post on Tik Tok also use those platforms already

Definitely look into Next DNS. There are also some Safari extensions that can block ads.

I also suggest buying refurbished unlocked phones in the future instead of going for the carrier freebies which you can see are scams designed to lock you into paying for their overpriced service each month for over a year.

Vivaldi overheats my Macbook and runs like crap on my PC.

I switched to US Mobile a couple months ago and it has been a much better experience.

Libgen dot is

iPhone has the better reputation for privacy/security, however it is proprietary software and so no one can really tell for sure what kind of data that Apple might collect on you.