You can't access expensive hardware on YouTube.

If you want to learn about chemistry or biology for learning's sake, good luck. Most autodidacts won't have space in their apartment for a -80C freezer or flammables cabinet, and their landlords might not approve the installation of a proper fume hood.

We have things very easy in software. The cost of iteration is low, you can fit a respectable laboratory in the space underneath your desk, and you're unlikely to accidentally poison or maim somebody if you screw up an unwise experiment. Not many fields have that luxury.