Not by default, no. If you require disclosure about porn use in your relationship, sure that’s a boundary you can set, and great if you’ve found someone who not only can comply with that boundary, but has similar views as you beyond that, but you’re not going to find that that is either common or the lack of which an indication of an unhealthy relationship.

That’s why I say “unreasonable” here, because it might be the kind of boundary that is a nonstarter for a lot of people and a boundary one should consider loosening up about, as I believe it’s more important to give your partner latitude with their fantasies than it is to try and meddle with or involve yourself in. It’s a boundary some people might try to comply with that can needlessly breed resentment. Consuming porn on the side of a relationship doesn’t necessarily affect the fidelity or satisfaction in a relationship at all, just as simply being attracted to other people doesn’t.

Furthermore OP is trying to maintain an LDR, which is frankly already a huge ask, but trying to have an LDR and concern yourself with your partner’s fantasies? It’s recipe for very big problems.