Offline marketing ads from tech companies

I noticed few offline marketing ads by few tech companies recently in Berlin. You may say, they already have good brand presence & social channel to promote. why offline?

1. Firefox Quantum

2. Slack

Slack is mainly used by tech companies, looks like they want to attract more users from non-tech companies.

Slack Ad at Berlin train station

3. HUAWEI customer service Berlin

Very nice strategy by Huawei, kind of gamification / create attraction. They gave these keys near the market area, asked the people to go to their store to unlock.