Redirecting Expired Domains... Good or Bad?

I've heard about buying expired domains and redirecting them to your site. Is this still a good tactic?
A company I talked to said that they do broken linkbuilding this way. Find a broken link on high traffic site. buy the expired domain and point it to client's homepage.

Is this a good idea? If so, how many domains can you redirect before Google penalizes you for it?

If you want a successful 301 redirect you need:

- High end domain, auction one, ideally 200+ RD
- Super relevant one, considering anchor texts will get redirected as well
- It has to be ranking at least somewhere, so you have to build it up, let it age and then redirect
- It can take months before 301 redirect takes effect, if it does at all

Or use a search function.

https://www.blackhatworld.com/seo/redirecting-301-expired-domains-in-2017.971902/
https://www.blackhatworld.com/seo/301-redirection-for-expired-domain.896916/
https://www.blackhatworld.com/seo/301-redirecting-unrelated-expired-domain.823200/
https://www.blackhatworld.com/seo/should-i-use-expired-domains-for-301-redirect-or-pbn.704132/
https://www.blackhatworld.com/seo/e...a-301-redirect-for-9-years-still-good.870957/
https://www.blackhatworld.com/seo/3...th-backlinks-to-your-site-still-works.937016/
https://www.blackhatworld.com/seo/good-metrics-expired-domain-turn-into-301-redirect-or-pbn.872822/
https://www.blackhatworld.com/seo/can-i-rank-via-redirect-301-expired-domain.928835/
https://www.blackhatworld.com/seo/301-redirect-expired-domains.649958/
https://www.blackhatworld.com/seo/b...domain-with-inner-pages-to-money-site.663132/
https://www.blackhatworld.com/seo/e...ct-or-wordpress-install-with-backlink.685021/
https://www.blackhatworld.com/seo/301-redirect-something-im-quite-confused-about.863579/
https://www.blackhatworld.com/seo/question-about-301-redirect-of-expired-domain.880116/
https://www.blackhatworld.com/seo/proper-301-redirect.793079/
https://www.blackhatworld.com/tags/301-expired-domain/
https://www.blackhatworld.com/seo/301-expired-domain-redirection.814936/
https://www.blackhatworld.com/seo/301-expired-domain-to-web-2-0.885442/
https://www.blackhatworld.com/seo/about-to-buy-expired-domain-should-i-301-redirect-or-pbn.837927/
https://www.blackhatworld.com/seo/doubt-about-301-domain-expired-redirect-seo.954101/
https://www.blackhatworld.com/seo/redirect-301-link-building-system-for-seo.961111/
https://www.blackhatworld.com/seo/using-301-redirect-to-rank-a-new-domain.858695/