Please stop reporting all OF models as spam. If a post is off-topic, report is as off-topic. If community rules forbid OF models from posting, report that. If a user is flooding a sub with multiple posts a day in a row, that’s a legit report as well.
Otherwise a post by an OF model is not in and of itself spam, even if it is made by a <ferengi>female</ferengi> with the temerity to control her own sexuality.
Personally I’d be fine with allowing it in bios only. If people want to see more, they’ll check out the bio, and see the link there. In other cases someone will just be like “… Nice.” without feeling advertised to.
In the end, it’s all about the rules the community itself puts up. Personally, I get more enjoyment out of fewer “real” (imperfect/amateur) out-of-love quality, than more perfect/fitgirl for-profit quantity. But I’m aware this is generally a minority opinion.