I don't know for a fact that there was any such pressure that forced Bloom to cut those ties. Just speculating as to the reason.
I have no inside knowledge, but I could see Tony Bloom being a bit uncomfortable with the enhanced profile of his relationship with Star Lizard that the Premier League has brought. Things like this article: https://www.nytimes.com/2017/08/11/...betting-in-soccer-but-not-for-the-lizard.html
I was sent an e-copy of a book (this one: http://amzn.to/2F0FuJA) .that went into quite a lot of detail about both Matthew Benham (Brentford) and our Tony and, again, I can't imagine he likes that kind of publicity.