@Becky88,
I now have a better understanding why you were alarmed about the non-communicated service fee increase, because your payout is impacted. My listings are set up with the host and guest sharing the service fee. I pay a flat 3% for the payout; a little less than the credit card fee for processing international currencies, and the guest pays the remainder of the service fee. This structure is very convenient for me.
I pay both Booking.com and Expedia.com 15% commission, and 3-4.5% to my credit card process. The base rates on these platforms are higher than on Airbnb, and I charge for required taxes, to cover the additional costs. The biggest problem that I have with both of those OTAs is with guests making a reservation with an invalid credit card, and having to wait wait at least 24 hours to cancel the booking if a valid payment isn't provided. During that time period, our calendar is blocked. This happens with about 40% of the Booking.com reservations, because of their marketing statement, "No credit card needed to book", but they put in very small print that accommodations have different prepayment policies. As a result of the poor quality of reservations, I will often break the calendar sync with other OTAs and my website. Dealing with Booking and Expedia does mean extra work, but on the flip side, I have the ability to collect an actual security deposit.