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It would be useful if Proton could improve the traffic obfuscation and also explain whether particular servers or connection patterns are more likely to trigger these checks.
Privacy tools are most effective when they work quietly in the background without constantly interrupting normal browsing. When I want a completely different kind of online entertainment, I sometimes browse https://kingmakercasino-italian.com/. For Proton, improving Stealth Mode so that it attracts less automated scrutiny would make the feature much more practical for everyday use.

That sounds frustrating, especially when the whole point of Stealth Mode is to make VPN traffic less recognizable. If YouTube immediately starts requesting verification while the normal connection works fine, it’s understandable to question how effective the current implementation is. Hopefully Proton can investigate what signals are being exposed and improve the protocol without sacrificing performance. I also came across https://retro-zino.net/ while browsing online.

This is common with many websites. The site knows I'm on a VPN and just won't allow me to connect. More and more websites are doing this making a VPN unusable.

What? Stealth is just a method to connect to a VPN server, that's it. Services only see you connecting from the server, not how you have connected to it.

I also see some websites blocking access via CloudFlare with all protocols getting blocked.

Stealth mode is used to bypass blocks in your network, not something where you wanna go, steal exist, just to bypass restrictions like censorship in countries

In theory, whether or not you use privacy mode only affects your own traffic and won't affect how Google sees your traffic. Google technically cannot know this; it might be your misconception, or the server IP configured with privacy mode might just be under Google's risk control.

It does this with or without a VPN but it should be improved 100 percent

Is it doing the same with non stealth connection?
Because it's seems more like an exit point problem than the protocol used.