As someone who remembers being uber frustrated at having to use trillian to talk to all of my friend, I disagree, there was major fragmentation back then as well. Also for which BBS you were on, which friends were on AOL or other nerfed internet.
Would trust this service, if I could read the source. I don't know what the plan with MeetFranz is, but since it isn't open source, something tells me that there at some point will be monetization involved. Monetization isn't bad, but it also will at some point cause misalignment between it and the users.