Wasting time is nor considered stealing. If it were, there is a long queue to collect money from: all the add agencies, telephone menues where you have to go 10 level deep before you speak to a person, anyone who is bothering people on the street with questions, anyone making your possessions dirty would be a criminal. Anyone going on a date that doesnt work out would be a criminal.
Sure, but I'm still going to be pretty annoyed with you. And if you've wasted my time by messing with a system or process under my control then I'm probably going to block you from that system or process.
As a really prosaic example, I've blocked dozens - if not hundreds - of recruiter email addresses on my work email account.