I have tried Instagram with no luck. The problem is that you don't know which young women are looking for an SD.The venue may change but money never, ever stops being attractive to young ladies. That is the universal advantage and is never gone.
If we assume that only 5 percent of women are interested in this type of relationship, you can send a lot of messages on Instagram. And come across as a bit creepy.
With Seeking, you know that they are looking for an SD ..... although many seem to bail before finding one.