nrp wrote:
A relative is working on a PPL using a Diamond DA20. The FBO has a
policy of no student solos with more than 5 knots crosswind component.
Do other FBOs do this?

Typically, your instructor sets crosswind limits. The student will
usually start out @ 5, and the instructor should gradually increase the
limit as the student nears the check ride.

I trained at a single runway field that almost always had crosswinds.
My original solo limit was 5 knots, it reached 10 for cross-countries,
then 15, then I took my ride. The airplanes I fly have typical max.
demonstrated crosswind components of 17-18 knots.

The instructor will typically set endorsed limits even if the student
owns the plane, as the instructor is also on the hook for student accidents.