Of course a provider can offer convenient shortcuts, but at the cost of getting tied into their ecosystem.
Anthropic is clearly battling an existential threat: what happens when our paying users figure out they can get a better and cheaper model elsewhere.
They solved that with subscriptions. For end-users (and developers using AI for coding), it makes no sense to go for pay-as-you-go API use, as anything interesting will burn more than the monthly subscription worth of $$$ in API costs in few hours to days.
Sure subscription is a sort of tie in, but only if users are fooled into investing in workflows bound to anthropic. That's what the company is hooking them to do with this scheduler, banning open agentic framework and the rest.
The moat, if any, will be the tooling. Token is becoming a commodity, they know it.
Such a service will always be destroyed by the bell-ends who want to run spam or worse activities.
(And on Android, AFAIK there's exactly nothing at all. There's not even common support for any kind of basic automation; only recent exception is Samsung. From third-party apps, there's always been Tasker - very powerful, but the UX almost makes you want to learn to write Android apps instead.)
I think the core problem is not so much that it is not "allowed", but that even the most basic types of automation involves programming. I mean "programming" here in the abstract sense of "methodically breaking up a problem into smaller steps and control flows". Many people are not interested in learning to automate things, or are only interested until they learn that it will involve having to learn new things.
There is no secret conspiracy stopping people from learning to automate things, rather I think it's quite the opposite: many forces in society are trying to push people to automate more and more, but most are simply not interested in learning to do so. See for example the bazillion different "learn to code" programs.
Computing isn't, and has never been, demand-driven. It's all supply-driven. People choose from what's made available by vendors, and nobody bothers listening to user feedback.