feel like wave and trap influenced each other as modern sounds have taken a much more electronic turn. i wonder if early works such as gab3/uzi have ever heard of wave music as well as other modern rappers
solidslime this is different from future garage b/c the beat is more inspired by hip-hop / trap (pay attention to the hihats in comparison to the those of future garage). Also, the bass tends to be wider and thicker than in future garage. There are similarities, tho. I would say wave is a subgenre of chill trap or future bass.
Der N3[R]O this is not synthwave. That term applied to music, also called retrowave, that generally has rock beats, a pulsing bass, and retro lead synths.