Google Ads as a Service? Will you try it for 7 days for free?

I am a Google ads specialist and want to launch my agency as a service, so new customers can try my service for 7 days if they like it they will pay me, and if something happens and they don't want to continue, they won't pay me anything. So how does it work? Google makes you run your ads without paying anything, and it will charge you for the total cost of clicks on the first day of each month, but you need to add your payment method first to make your ads show, and you could avoid automatic payments by withdrawing all your balance and just see what the ads cost you at the end of each month and go and charge your credit card with that amount. For me, I will create a Google ads account for you, and set up your ads and keywords, and my job during the 7 days is to make it get results for you based on your target, and I will make an online call to explain to you the Google Ads app, and how you could set up your payment method, for security, you must do it yourself, also I will explain how to see the number of clicks and cost per clicks and the total cost that you should pay it at the end of each month, after the 7 days free trial, if you liked our service you could pay us the price that we agreed on it before starting the contract and we will transfer the Google ads account ownership to you, and if something happens and you don't want to continue, you won't pay us anything, but you have to pay for google the cost of clicks for that 7 days yourself, and you will delete your Gmail account connected to this google ads account because google doesn't allow you to remove your payment method unless you add another payment method and make it primary, you could create dummy gmail account during the 7 days and delete it after that What are the steps for this? First, I will create a Google ads account for the client, setting up their keywords and search ads and showing them a preview of the ads so that if they have any changes I could change them before continuing. Second, I will make an online call with them to explain to them how to use the Google Ads App, how they can see the clicks and cost per click and the total cost, and how they can set up their payment method. Third, I will leave the client to add their payment method himself and once it succeded, he could tell me and the 7-day free trial will start from the second day. Lastly, after the 7 days, if the client wants to continue, he will pay us the price that we agreed on, and we will transfer the ownership of the Google ads account for him and he could use it forever. If he doesn't want to continue, he should pay any costs to Google and we will delete the campaign we created. The client should delete his Gmail account to ensure that his payment method is not connected to Google because Google won't allow you to delete it unless you add another one and make it primary. If you have a business and want to advertise on Google, will you try a service like that for 7 days? Could I know your thoughts?