Most anything offline SMPS isn't really something you'd want in a YT vid, or advertising as jellybean. UC3842 etc. are fine at low voltages, which should be plenty as a learning experience, and practical already, without getting into the safety and EMC issues an offline SMPS has.
The real trouble with offline controllers/regulators is there aren't many jellybeans as such; there are dozens of cheap and generic ones, particularly Chinese (Taiwan or otherwise), that don't show up on western distributors, don't even have English datasheets, or perhaps even aren't generally available if you aren't in walking distance from the factory, give or take NDAs, etc.. So, it's the kind of business generally left to few highly-interested, specialized, or otherwise privileged manufacturers, and, with the other issues of those supplies, that's kind of just as well.
Speaking of 34063, perhaps a video explaining why they're so awful, and why the alternatives are so much better -- at least NCP3063 for example, or NCV5173, but also the myriad other easy-to-use regulators, and how to choose them; the proper answer these days is not to rely on any single part that's poorly suited to any particular application, but to understand what they do and how to select one for a given application.
Tim
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