At minimum the cheap ones have lower QA tolerances on components. Sometimes they straight up swap in shittier components (eg: plastic instead of metal, etc).
Not saying you always need the most expensive option when choosing power tools, but looks same != same.
What’s your objection to Proton? You don’t have to use any of the other products, and the free tier is perfectly usable last I checked (granted many years ago). Not sure what your concern is
Edit: downvoting without replying doesn’t tell us what the concern is. Y’all weird