Yep, Novomatic and Merkur definitely have these and have commented on this before elsewhere. The games have the same RTP as the actual play for real games as well! Surely should be age restricted.
Also, I'd wager most of today's 'youth' are probably using a VPN anyway when browsing, which deems any geo-restricting pretty useless.
Like I said, the UKGC need to be doing something constructive, not pissing off affiliates.