Not just a tool for monitoring, but a tool for propaganda delivery and indoctrination for anyone with a message and cash to burn.
Proper journalism costs money and requires focused attention to consume and metabolize. Propaganda is shiny, sweet, goes down easy and it's always free.
This is an issue to take up with individual website operators.
Almost every large website is going to be protected by both a CDN and an application firewall, either of which can be configured to slow down, gatekeep or outright block traffic coming from an IP that is suspected to be a VPN. And there are many reasons why they could be doing this:
The only solution I can see is to reach out to the site operators themselves and explain your valid use case. I’ve done this a few times myself. I’ve never received a response, but some of the websites that I visit which used to block my VPN traffic eventually stopped blocking it.
If you don’t like something, make some noise.
Alternatively, you could use a cloud provider to spin up a micro instance running your own OpenVPN server that you re-roll IPs on occasionally, but this takes more effort and doesn’t really address the root cause.