You know what's funny, is I think the face printing and logo on the slope piece are actually Lego decals from Classic Space
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Honestly, with the price of lego and their own deviation from the "Lego" aesthetic in recent years I wouldn't fault anyone for sticking with the clones. I have used quite a few of the "compatible" sets from China and other than the logo on top of the studs they are identical. Even the colors are on point these days.
Any clone brands you recommend ?
I would think the issue would be for obviously non-lego pieces. Not knockoff stuff, but like, K'Nex or something clearly not interoperable.
I wouldn't clock any of the pieces in that picture as non-standard, personally.