I'm pig sick of OLD too. Last one was, I think, an abuser in the making.
Anyway. I think your 'strategy', so to speak, needs a tweak.
You're investing in a woman who has said she only sees friendship with you. Why? Ok, relationships can emerge from friendships but she has said that she sees it as platonic so why not take her word at that, enjoy your chats but talk to others who may see you romantically.
Also, on OLD, certainly until you have had a date, it is expected that you would be chatting to others too. It's how OLD works. It is not necessary to say so explicitly which yes, draws attention to the drawbacks of the medium and makes someone feel less special. I once called off a date when a match told me all about another date a couple of days before we met. It was all done in the spirit of openness and camaraderie, I didn't hold it against him, but some discretion is needed to make it work. Of course, if asked outright then don't lie, but there was no need to offer this info.
Keep chats short and meet quickly to sift out those you'd like to know better. You don't get to know people better by chatting online for weeks (even with facetime). Then, after a date or two, if you want to continue, move to seeing one exclusively. If you prefer to chat to only one, fine, but if they only want friendship then it's likely a hiding to nothing. Personally I prefer not to kiss or do anything physical with more than one at once, also get exhausted with too many chats so do keep it limited.