How should I (26F) address my boyfriend (30M) regarding his social media follows?

My boyfriend and I have been together for nearly a year, and recently I've started to feel uneasy about who he’s following on social media. Most of these accounts belong to girls who share risqué photos and videos, often linking to their OnlyFans pages. This raises questions for me about whether he’s spending money on this content or using other platforms like Snapchat or Telegram that I’m unaware of. Additionally, he recently began following his ex, which adds another layer to my concerns. A couple of months ago, I expressed how uncomfortable this made me feel, and he did unfollow several of those accounts, but he’s since followed a bunch of new ones that evoke similar feelings. While I’m fine with him watching porn, following these accounts feels different and undermines my trust in him. It makes me feel insecure and hesitant to share anything personal with him. I’m seeking advice on how to address this issue productively. Given that I’ve already raised it before, should I view this as a red flag? I’m torn and would appreciate some outside perspectives.