Yes, and so do NZ and Australia. I actually think the biggest influencer is probably EITAS, which is the same thing for the Schengen area (yet to come into force).
It’s a part of a wider trend going forward. I will say the UK/EU systems are fairly unique in that they aren’t excluding each other. Canadians don’t need ESTAs nor do Americans need Canadian ETAs
Canada, at least, already uses an ETA system called exactly that (or I guess TAE in French), so that probably had greater influence than the US ESTA.