Stay away from Adkinsbet, they are most likely not legit. These two users recommending them is probably bought accounts - there is a whole army of bought Adkinsbet accounts, shilling their site, like for example this account and many more.

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For your initial question I can only add, that I got a limit pretty fast and limits weren't very high, but I was only betting on smaller niche markets. For mainstream football markets, you might be able to bet quite a lot, would suprise me, if they had low limits there. Just make a smaller deposit first and see, you can always deposit more