It's very unfortunate their business models forbid this. The third party client I use for Reddit is great! (redditisfun)

It'd be so much better if we just paid a small sum to own our accounts on those platforms. How much would it cost? Like a Netflix subscription? That'd be worth it.

I guess one reason why that isn't possible is that the platforms only work if everyone* is there, irregardless of income. If there's a subscription fee not everyone will afford it, especially young people who are (arguably) culturally more influential.