Corporate have ad hoc backbones in many case if big otherwise specific subscriptions that can be handled differently, about the encryption....well, 90% of the providers you see around aren't safe by default (the real boom and cheap prices came with VPNs to watch Netflix, play online, and daily stuffs), first you have to see in which country they are and what does the country dictate, not all of them avoid logging or deletes / obfuscates the logs, even fewer implement different / multiple exit points on the network, and if you are so lucky to end up in a cucked country, for the ISPs is a second to track and proof you were connecting tru server x and law enforcers can go get it in less than a day, about encryption instead yes, it is, but again much depends on the VPN provider and client / server setup, plus, there's since over 10 years hardware dedicated to TAP / breakdown specific type of connections, links, and so on, today, add there unlimited parallel compute power agencies have available, be sure that, if you are in their list, and you don't pay so much attention at anonymity, they will get you, keep in mind that really few people are really aware of what it takes for 'full privacy', a VPN is the first step if we talk about connection, but if you are distracted and open the wrong site / email or whatever that can associate you to your intelligence profile / routine, you just wasted time, and after that, there are many more other stuffs involved like your habits, from where did you connect, the hardware you use, and so forth

Sorry for the length but i hope this may give a better view on how this works, to much people lately wrongly thinks to be safe because they have a VPN