It provides pretty good translations, but it’s not particularly good for privacy. Obviously it’s better than Google, but their privacy policy isn’t great.
I run 2 nodes at my house, several nodes (including exit nodes) on different VPS providers and I use the Snowflake addon in all of my browsers. But Tor is meant for people who require anonymity and the ability to circumvent censorship, not for those who don’t want to pay for a VPN.
Mullvad is great. Also check out IVPN, they are kinda similar to Mullvad (they also allow for anonymous registration without an Email address and they accept anonymous Monero payments). Maybe take a look at AirVPN if you need port forwarding.
You can create an account on a Piped instance and use it to sync your subscriptions and playlists. You can also log into your account when using LibreTube on Android. Invidious also allows for account creation, but I’m not aware of any mobile apps allowing to connect to it.
I’d err on the side of caution. I always use a VPN for privacy reasons, my ISP doesn’t need to know what websites I’m visiting and which P2P protocols I use. Also, there’s no need to expose my approximate geographical location to every service I connect to.
Have fun! Don’t hesitate to ask me via DM if you have a question or encounter any problems as I’d say I’m quite experienced with all the tools I listed.
Piped is better for privacy because it proxies everything through the Piped server, with Invidious you still leak your IP to Google. I also prefer the UI of the Piped web client.