Lula launched his final election campaign.
He spoke to thousands of workers in a stadium.
He proposes a shorter work week and safety rules for app workers.
Many workers now earn money through apps instead of regular jobs.
Companies and some workers are unsure about the new rules.
He talked to many workers in a big stadium, remembering old protests.
He wants new rules to help people who work using phone apps, like delivering food.
Some companies do not want these new rules.
A different politician, Flavio Bolsonaro, also wants to be president.
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