These posting services are doing the same thing - burning their CL accounts. They create tons of “burner” CL accounts specifically for this purpose. And most of them use “bots” to automate the entire process… You upload your ad, specify the metro areas of interest, it will create 1,000 burner emails and CL accounts, and VOILÀ! Tons of ads in minutes. It’s all transparent to you and as far as you know they have a team of Malaysian’s hard at work on this manually.
It’s a continuous issue for CL to block these services as they’re always abusing CL’s Terms of Service.