I have no idea if it's trending, but it is not new.
Usually called "closed communion," it is restricted to members, the only people who are under the jurisdiction of the local church.
"Close communion" allows communion to be served to those of "like faith and order." That was the practice of the Southern Baptist church in which I grew up; Baptist churches variously extend that to the denomination, or to Baptists in general, or even of those outside the denomination that adhere to Baptistic principles. It's up to the local church.
Among Primitive Baptists, those from other Primitive Baptist churches with whom the local church is in fellowship normally allow such visitors to take communion. When I attended a Primitive Baptist service I would not be allowed to partake even though I was a Southern Baptists. In addition, if I had wanted to join the congregation I would have been required to be baptized as a Primitive even though I had already been immersed in a Southern Baptist Church.
We formerly had an Orthodox Presbyterian church in town that allowed visitors to take communion, but only after talking with the elders so they could be sure the visitors were able to participate.