@samurro Sorry, we're not that many following those hashtags :)
Personally, I play the same systems I play in group : dnd, Shadowrun and Traveller, with Mythic GME on top.
There are many reasons to love #solorpg, like the love of writing (tried to have my friends play PbP, this didn't pan out 😅), the desire to finally be a player when you're a forever DM, the desire to finally see a campaign reach conclusion, etc. In about 10 years of roleplaying, I haven't see a campaign with other players reach conclusion, as a player or as a DM. Not once. Supposedly "life" gets in the way, systematically. Maybe I'm unlucky. And it's even more annoying when you've been doing worldbuilding specifically crafted for the characters of your players.
With solorpg, I can build as much as I want, nobody can take it from me. The emergent storytelling is there thanks to Mythic or other oracle systems - actually way better than when DMing. And the social aspect is there too, just have characters discussing.🤷