This isn't something that can be defeated like this. You are right, there will be ways around this. But we also have to be honest: being able to buy "off the shelf", two click VPN solution for 5$ already puts you into "geek" category. Relatively speaking.
If they ban the commercial providers, payment processors will be the first to enforce it. And Google and Apple will throw the 1-Click solutions out of their app store for users from those countries immediately. And with that the topic is effectively dead even for most "geeks". At this point the goal is already pretty much achieved, most people are cutoff and under heavier surveillance. Next comes the group that know what a server is, how to rent one, what OpenVPN or Wireguard are. But many of the most used websites already make your life difficult if your IP is from such a range.
It goes on. At each step you can argue "there is still a way, as long as you got networking with other countries". Absolutely correct, but at each step the group who knows how and is willing to invest the energy shrinks. And the intended goal will likely already be achieved at the mentioned phase 1 above. The fact that some people still find ways isn't really a gotcha in this matter.
And at some point they will criminalize it. Does it matter that they are unlikely to catch you? Is it worth the risk? And if so, what if you catch strays for it from an unrelated matter. Ultimately they will simply target the devs that help build easy solution for the less tech-savy.
One big reason why you want to keep a bunch of nerds tunneling out around anyway is that you keep useful, defusing attitudes like that floating around. Aka "It's not that bad, there are still ways around it, haha, those idiots".