Yes. Your information that passes through their servers will be available for the third-party advertisers to either use for analytics purposes or targeting ads. You can use a free VPN by a company that earns its revenue through paid services, but I wouldn't rely on it as well. You can look for affordable plan or deals of some best VPN services to get the best out of your money.Selling our data?
The Turbo VPN is a free VPN which I used for my iPhone some time ago, initially, it worked really well which I was using to unblock the Netflix US Library in Canada. But later on it was useless, I could not browse the desired library. Moreover, It asked me to buy the updated version. Then I thought why not get one of the prominent ones. Since I needed it specifically for Netflix, where we all know Netflix has been blocking VPN services for quite long. I came by some recommendations as Netflix VPN. Some of the top ones included Express, Nord, IPVanish, and Astrill. Express had a good option to get 30 days money back which is good as a trial, I decided on getting the subscription for ExpressVPN to watch the US Netflix Library.
What do you mean by this?Try to create ur own with algo if u want to deep dive in connected with more effort.