Fairlay is one of the casino that use Pinnacle as odds provider since they are just 3rd party that offers Pinnacle market. The only problem is they have an issue here which they give verdict to a match as fixed match even though other casino grade the match which means they can do this to any match which they found questionable so I don’t really recommend this casino for your own safety.
Their reputation has definitely taken a hit because of that issue within this forum, but they are still decent overall since I withdrew several times from there without any issues.
The odds difference is just minor, why not settle first to reputable bookie like Stake while you are still looking for new casino as replacement?
The odds difference is minor only if betting in the short-term, but it's huge if betting in the long-term since Stake's odds offer no value at all when compared to Pinnacle odds which are usually some of the best in the industry.
They are maybe offering interesting odds but it won't be profitable for OP since they still don't accept new users. Months and years are passing but nothing change, they don't allow people to register and they don't explain why. I wonder why they still update their ANN here TBH, if they need to give some informations to their customers, they could just send them e-mails. I don't know if there are still hundreds or few dozens real active players there but it would be enough for such limited audience IMO.