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You're not crazy! The instrumentals in those songs do share striking similarities, and here's why:

1. David Guetta - "Play Hard"
- This track heavily samples Alice Deejay's "Better Off Alone" (1999) in its melody, which is a classic Eurodance anthem.
- The instrumental uses bright, repetitive synth riffs that create an infectious, upbeat energy—a hallmark of late '90s and early 2000s electronic music.

2. Wiz Khalifa - "Say Yeah"
- Wiz Khalifa’s "Say Yeah" also directly samples "Better Off Alone." The instrumental retains the iconic synth line but adapts it to a hip-hop beat.
- It merges electronic and rap genres, but the instantly recognizable synth riff ties it back to Alice Deejay's original track.

3. Kim Petras - "Party Till I Die"
- While Kim Petras's "Party Till I Die" doesn't directly sample "Better Off Alone," its instrumental carries a similar vibe. It borrows from the high-energy, synth-driven style of Eurodance and electronic pop.
- The rhythm, chord progressions, and synth tones echo the nostalgic electronic soundscape popularized by songs like "Better Off Alone."

Why Do They Sound Similar?
- Shared Influence: All three tracks draw from the same Eurodance and electronic music era that featured repetitive, melodic synth hooks designed to be catchy and danceable.
- Sampling: Two of the songs explicitly use the same source material ("Better Off Alone"), and the third draws inspiration from the same stylistic trends.
- Genre Conventions: The upbeat, bright synth sounds and repetitive chord structures are common in pop, electronic, and dance music, making them feel inherently similar.

These similarities highlight how influential a single melody or genre can be, inspiring artists across decades and genres to reuse or reimagine it in new ways.