By default, sidewalks and similar paths are pedestrian-only. Unlike Germany, Czech Republic is notorious for being overly explicit about what is allowed where.

Signs like End of cycleway are super overused:

There's also a separate sign for segregated foot/cycle paths.

This is how we end up with R5-10, which will soon be another sign that specifies e-bikes (and perhaps we need multiple discrete signs). We had a no phone use sign, then we needed no texting (or no mobile). The signage just hasn't caught up.

But it gets even weirder when you're talking about not even a roadway - so then signage changes between jurisdictions.

I tend to err on the side of caution, but dollars to donuts there's enough ambiguity in that signage you're thinking about where you can't really be ticketed because you can win the argument in court. What results is lack of enforcement (which is another legal defense in and of itself).

PS IDK if it's overthinking. This is the kind of stuff I think about lol (and apparently we've found our people)