VPNs that do no encrypt data?

Yes!
You can see the report on Android (free and not free) VPNs here:
https://research.csiro.au/ng/wp-content/uploads/sites/106/2016/08/paper-1.pdf
And an article summarizing it here:
https://www.techgig.com/tech-news/editors-pick/Avoid-these-10-insecure-VPN-apps-on-Android-88546?mailer_id=2888&utm_source=TG_batch&utm_medium=email&utm_campaign=digest_news_2017-01-26&etoken=cGZzaWx2YUBnbWFpbC5jb20=&activity_name=MjIwNzcw&dt=&auto_login=lKaUjJKbhWOnk7@@OkG6EkpNlR0eASYJcXXFUV1dlR0eASYJWWHhWV15YWFxy&src_type=autoLogin

Best VPN Services | PCMag

http://www.pcmag.com/article2/0,2817,2403388,00.asp?mailing_id=1825356&mailing=SecurityWatch&mailingID=D38C7109779FF73CBB7ABC2B5739266E

Why use a VPN?
Quoting:
"Most of us understand that we should use an antivirus utility to protect against ransomware and the other malicious tools used by hackers and scammers. But less well known is the humble virtual private network, or VPN. These services keep your Web traffic safe from scammers, hackers, and government snoops. If you ever use an unsecured public Wi-Fi network, this is an essential tool."