There is a misinformation spreading around that such front-ends for e.g. YouTube adding some privacy benefits, which is not entirely the case.

I do not intend to give people any advise on what to do, since this is already all known and discussed dozen of times. This is more meant as an informative post and nothing but this.

I will keep it brief so that people can easier comprehend it.

Reasons, in short

• Instances do not obfuscate your IP, there are tools which allow you to per-application wise use a proxy but this is not enabled by default because that depends on personal preferences and to avoid starving such free services to death. You better use a global VPN, Tor instead to isolate in general all traffic and not just per-application wise the traffic. Leaks can occur and you end up leaking your IP to the instance provider, assuming you do not self-host.
• Honeypot reasons. Most people use existent instances, smuggling in malicious instances on such a list is easy. Because not much have the ability to review code, assuming there is even the code for that instance mentioned. The instance owner can here see everything including your referrer, IP and so on. Same what e.g. YouTube would see if you use their official services.
• Most tools, like e.g. Freetube are not configured to use privacy related settings by default. Which means they are so configured by default that they work, without regarding maximum privacy. This is done to avoid problems that might occur.
• Propaganda reasons. Some instances and alternatives to YouTube are there to spread propaganda. I do not say that YT also do not include scam, spam, misinformation - no platform will be perfect - but other platforms are not better regarding this and there will never be a solution. Running into YT scam vs running into Bit-Chute Scam ends-up with the same privacy implications.
• Installing more software and alternatives increase the risks. This is a mathematically thing, now you can argue that you can use it in your Browser, the thing is people usually then ending up installing Browser extensions ala redirector or some userscripts. This can be fatal, makes you more unique, assuming you do care at fingerprinting. The argument to use more services or other alternatives do not change much, they work usually similar, you login to upload something etc. The Internet was never designed to be anonymous and never will be. The logic here in using alternative pages do not change the fact that you still need to go trough the whole process. Accounts, the owner or hoster sees IP etc. So nothing improves here.
• Some alternative Services and alternatives are highly controversial and often do exactly the same as YouTube, Facebook and co. Exponential growth means you need to implement exponential counter-measures. Odysee is such negative example. Even if you use such an alternative and an alternative front-end, tool and whatnot, it will not change that they collect like the rest, for statistics and whatnot. The better idea is to choose services that have a security and privacy model that makes most sense to begin with.