Nobody should be using a VPN provider, full-stop. It is structurally impossible for anyone to verify their claims, they have more incentive to lie than your ISP does, and they're cheap and easy to set up, so the industry is a cesspool.
You should assume that all of them are behaving badly.
Also, hasn't CloudFlare been audited to verify their no log claims? I know while Mullvad hasn't been audited to verify their no log claims, they have at least been audited to verify the security of their app.
Plenty of people using VPN for: pirating, get an IP from a foreign country to bypass some content limitation etc., so they still need one, secure or not.
Nobody should be using a VPN provider, full-stop. It is structurally impossible for anyone to verify their claims, they have more incentive to lie than your ISP does, and they're cheap and easy to set up, so the industry is a cesspool.
You should assume that all of them are behaving badly.