I personally don't think I will spend any more than I already did with the TAB. In fact I may even spend less as I won't be putting as much time into looking at the odds and working out where I see value.
I do a bit of live betting as I can often find value there or even arbitrage opportunities, obviously the latter becomes more difficult with one operator and I do find there website live delays quite frustrating.
I would suspect the type of punters they will pick up are the ones betting into your first try scorer and sports multi markets.
I have shares in 4 horses at present, I am fairly confident these will be my last four (not because of this decision) as I am loosing a bit of interest in racing and the Entain money will run out in a few years.