Based on my own experiences, I don't think ISP's are blocking anything. Now, I know that this will not go down well, but it's tough I suppose.
I went through issue after issue after issue with my IPTV being blocked every time Prem League was on, I blamed my ISP over and over and they refused to accept fault, my IPTV provider refused to admit fault time and time again, constantly telling me there are xxx thousands of people working, the fault is you, it's not us etc etc etc.
In the end, my provider cancelled my service and gave me a refund as apparently I had been bad mouthing them on TechkIngs, yeah I was, cos their service was awful and I stand by that, there are too many providers who refuse to admit fault, sending me an e-mail saying 5000 people are watching IPTV, so the problem is at your end is not an answer.
So, explain this. How come ever since my IPTV was cancelled, I have switched to a free Kodi add-on and for the past 6 weeks I have watch Prem League every weekend, no blocks, no buffering, just perfect streams, no VPN either????
Just to test this, I got 3 free IPTV trials this past weekend, 2 of them went off when the football came on, 1 of them worked worked, but buffered like hell.
I switched back to a 'free' Kodi add-on and it worked perfectly.
So, how is this not the fault of the IPTV provider? How is this my fault?
Bottom line is 90% of IPTV providers are truly awful and just won't admit it. If all you want IPTV for is football like me, just use a free Kodi add-on.
I know people are going to reply and say Kodi is crap, it doesn't work, wait until a big match comes on etc etc etc.
Weird, Man U v Barcelona is a pretty big match and I had 0 buffers/break-ups.