Most of the limits being mentioned above look like defaults. I have one site that has a £99000 limit too...

The "light touch" (their words) background checks will be done at £150 per month from the end of February, and I expect sites will then set a secondary limit from there... after which point people will be into the CDD/SoW merry-go-round.
Remember this calculation is done per site - so a problematic player can still do that on
multiple sites and fly under the radar while losing a fortune... the alternative was the Single Customer View (SCV) project which is a mammoth invasion of privacy and was rightly shot down by the ICO.
Bookies still restricted to 4 FOBT per shop and close at 10PM, also seem to have implemented a chat with customers when they go over £500 in or whatever
Arcades on the other hand...
And that's why the Bookies have been scaling back...
they used their own loophole (multiple premises) to allow them to have 8, 12, 16 FOBTs... because it was by far their best earner. I'm a little surprised they haven't moved into the AGC space themselves...
Now the Adult Gaming Centre meta has come along and eaten that lunch - Admiral and Merkur seems to be expanding into every space they can find - long hours, ridiculous numbers of machines, and already plenty of stories of people exhibiting gambling problems that are being ignored.
This will predictably get worse if and when the 50/50 rule comes in... because all those "£100" FOBT-style terminals can be switched to £500 overnight. Unlike the bookies (4 machines) and casinos (20/80/150 machines, with no, 2:1 or 5:1 table ratio respectively), there are no limits... so AGC's could quickly become the new "super casinos" on the sly...
... and you wonder why the industry is aggressively pushing for £1000 jackpots and similar, there is your answer!