All the information a browser would need is usually in open access, including even the means of
contacting a provider. In fact, the website doesn't need any special features that allow people to message the providers on the spot. The workers need to specify their contact information – mostly phone numbers – in the profile description.
It may sound harsh for the workers, because there's no telling what sort of people are going to visit the website and try to call the people who left the ads there. However, it's not really a pressing issue.
Although scamming is generally a versatile occupation, there are very little of these people on the receiving end of the services – mostly because they don't have any sort
of leverage to scam people with. They can surely arrange a meeting and scam a worker then, but it's usually easy to figure out the true intentions on the phone, and this sort of scamming is often time-consuming and tiring.
The only other worry you might have regarding this system is that people will call you just to mess with you. But this sort of childish behavior is very scarce on platforms that supply escort services. It just doesn't attract the right userbase for it.
The advantage of having this system in place, however, is that you generally get more potential customers in your area. The new users can see your applications immediately and they don't get hindered by the website at al. The only genuine issue is that the website can't keep track on
people who call you. If you are not comfortable with it, it may not be the
best place to seek job.
MegaPersonals is very liberal regarding many aspects of providing or receiving services. They have a very limited role in this whole affair, and they don't dictate you what to do.