Does press releases improve SEO?

Hello, I am launching several products and I am trying to improve SEO. Is publishing press releases still effective? It looks like I am losing money doing that without getting any return.

I posted for many apps I created, and doesn't seem to have much effect yet, It might take some time. Does anybody know if those make difference for SEO?

Photo Vault https://www.marketwatch.com/press-release/online-alternative-to-google-photo-launches-2019-12-24

Moodify https://www.marketwatch.com/press-release/moods-and-more-new-web-app-helps-users-to-track-moods-and-more-2019-12-24

pDrive https://www.marketwatch.com/press-release/pdrive-offers-powerful-document-storage-alternative-to-google-drive-2019-12-25

pBookmarks
https://www.marketwatch.com/press-release/protect-your-online-security-in-2020-with-all-in-one-bookmark-manager-from-pbookmarks-2019-12-25

Bitcoin4Photos https://www.marketwatch.com/press-release/bitcoin4photos-fairly-compensates-artists-for-their-work-with-bitcoin-2019-12-26

Secure Calendar https://www.marketwatch.com/press-release/secure-calendar-launches-free-encrypted-calendar-app-2019-12-26

MyPodium https://www.marketwatch.com/press-release/new-audio-only-share-platform-allows-users-to-post-messages-for-boos-and-cheers-2019-12-26

pNotes https://www.marketwatch.com/press-release/pstack-launches-pnotes-a-free-open-source-and-end-to-end-encrypted-note-taking-app-2019-12-25

SatsHI https://www.marketwatch.com/press-release/zero-fee-bitcoin-based-streaming-platform-2019-12-26

BitPatron https://www.marketwatch.com/press-release/bitpatron-announces-launch-offers-censorship-free-alternative-to-patreon-2019-12-26

pForms https://www.marketwatch.com/press-release/keep-surveys-anonymous-with-pforms-2019-12-26