Sorry if you have a bad experience. As a kind person let me to explain what happened and try to convert that hate into something better.
When you get the tab that you mention you can make it dissapear just turning off KProxy. You have a button on that window to do it, also you can do it clicking on the blue hat.
You get that tab because you used KProxy for 3 hours or you downloaded more than 300 MB (we are trying to improve this) and that tab says that you have to wait 30 minutes to have another 3 hours or 300 MB window. You can use KProxy Extension free forever.
Why we don't disconnect KProxy when you reach the limit to avoid that tab again and again when you try to surf? Because people should know when they are protected. People must stop KProxy to know really that they are not using KProxy. Perhaps, if we don't care about people safety we should turn off KProxy and we will avoid situations like this one.
KProxy extension is designed for surfing, if you only surf, it acutally never stops. If you see videos or download stuff you will reach the limit. We know that there is people that can't pay or don't want to pay, but we still want to offer a reliable service for everyone. It could be annoying, but we want to maintain a fast and free for surfing service and give freedom to everyone. If we don't stop downloads, then this is not possible.
KProxy doesn't have ads, doesn't sell your data, doesn't sell your bandwidth like other VPN's do (those is really malware). KProxy is only possible because of awesome people that thinks that pay for the PRO service is worth of it.
Other VPN's work great at first, then eventually they become slow and not usable. Other are bubbles that get more and more users expecting to sell the company to a big fish or eventually close because the project is not financially reliable.
Well, we will never be rich, but we are here for years (since 2005) and we don't expect to close this service in the near future. We want to offer our service for free to everyone that can wait 30 minutes.