I’m not saying you should trust every VPN provider. Some have shown to be nore trustworthy than others. Police have raided their datacenrers and not gotten anything (no logs). And they have gone to courts and said they don’t keep that info. However if you don’t trust your ISP, and purely use a VPN, the only info your ISP will get is that you use a VPN. Your encrypted bank packet that they saw before is now an encrypted vpn packet. The vpn will see the encrypted bank packet, but youmre right, you have to trust that they have more to gain by not looking and selling than they gain by selling your info and losing customers.