I consulted for a few UGC technology. I also consulted for companies that use UGC as their primary form of business. It's usually a two way business stream, obtaining UGC creators and getting new clients for the UGC
i use introhive and that captures emails and relationships. It's really good for professional services. Most of these email capturing tools upsell appending and enrichment. Most companies can also use third party sales enablement tools that capture email activtity. It depends what your tech stack is isaac
LOL just get a gohighlevel, the email with be controlled by sendgrid and SMS with twillo. Get yourself your own domain and warm that sucker up and you are good to go