I'm not sure how sites like Talkspace operate in terms of licensing for online counseling, but it still is required that therapists have to be licensed in the state where the client resides for it to be legal to work by phone or online. This is because while there may be national certifications for some types of training, the states have jurisdiction over who is allowed to actually practice and especially who is allowed to be paid by insurance, which itself is mostly controlled state by state. I have a few colleague friends who are licensed in several states so that they can continue to serve clients after relocating, or because they have family in other states who like to refer to them. Being licensed in several states and working with distance clients makes the therapist liable for each state's business and personal income tax too, so few are willing to go to all the trouble.
Then there is problem of the professional bodies like the APA, ACA, or NCSW that rule over the ethical behavior of therapists and social workers that tend to hold a very conservative view that it is unethical to start a client in phone or online sessions if they aren't already an established client. Thankfully the Covid issue has loosened some restrictions on telehealth insurance payments, but not all the various jurisdictional pieces line up as smoothly as they should.
Although I did phone sessions for 20 years with my clients, most therapists aren't willing to risk their licensure to do telehealth, or don't feel comfortable not meeting with clients in person.
Just FYI. 😏