I haven’t paid much attention to 000webhost.com lately and sure have missed some things. But what i read on the forums and their Terms of Service about them now displaying “one popup per website once within 7 days” sounds much like forced ads to me. Personally i haven’t come across one of those popups yet, but i guess they display one of the Hostinger ads they have to push their new free hosting business. They also managed to hide that “one popup per website per week” thing very well in their ToS. Really have to look hard and the first time i went through the ToS i missed it hehe :)
That being said there are also good news:
If you can’t be arsed to look at a popup on your website or do not want your visitors to see it then you can still disable the ads entirely. Works the same way as when disabling ads that are displayed when your account is considered inactive. Simply edit the .htaccess file in your public_html directory and add the two lines below at the very top of your .htaccess file, then save it.
12 php_value auto_prepend_file nonephp_value auto_append_file none
This will stop the server from adding the code responsible for displaying the ads on your website.